Publications

2024

• Croissance de monocristaux de ZnGeP2 et amélioration de leurs performances optiques par irradiation aux électrons de haute énergie et par dopage chimique
  
  • Vernozy--Trouillet Charlotte
  , 2024. L’importance des sources laser dans le Moyen InfraRouge (MIR), notamment pour la détection de gaz à distance, a conduit au développement de cristaux aux propriétés optiques non linéaires. Parmi eux, le ZnGeP2 (ZGP) s'est imposé comme un matériau de référence pour les Oscillateurs Paramétriques Optiques (OPO), grâce à ses excellentes propriétés optiques et thermiques. Toutefois, une absorption optique résiduelle demeure autour de 2 µm, longueur d’onde clé pour le pompage des OPO. Des défauts ponctuels formés lors de l’élaboration des cristaux, notamment les lacunes de zinc (V-Zn), en sont responsables. Plusieurs traitements comme le recuit, l’irradiation électronique et le dopage à l’étain sont explorés pour la réduire. Dans ce travail, ces approches sont étudiées pour améliorer la qualité optique du ZGP. L’élaboration des cristaux est d’abord mise en œuvre par la méthode Bridgman. Puis, en fonction des conditions de traitements des cristaux, des caractérisations des quantités en V-Zn sont réalisées par Résonance Paramagnétique Électronique (RPE) et des mesures d’absorption optique sont effectuées. Une diminution de la quantité en V-Zn d’un facteur 4 et une absorption optique de ~0,01 cm-1 sont observées dans ce travail. Grâce à l’efficacité du dopage à l’étain combiné au recuit et à une dose d’irradiation, ces travaux montrent l’obtention de cristaux de ZGP de meilleure qualité optique, ouvrant la voie à des applications laser plus performantes.
• Measurement of accidental radiation exposure by induced point defects in smartphone screens
  
  • Mobasher Mahinour
  , 2024. In attempts for emergency dosimetry, smartphone touchscreens and screen protectors are investigated in case of malicious attacks with radioactive sources or accidental overexposure. The analytical method is Electron Paramagnetic resonance (EPR) spectroscopy via the detection of paramagnetic point defects in Gorilla® Glass 5 (GG5), Victus (GG7) and in six different types of screen protectors (SPs). The first step before the dosimetric properties’ evaluation was the identification of the different overlapping signal components in the EPR spectra and attribution to different point defects. For this, several samples of glass with simplified compositions were synthesized. The attribution of the different point defects was achieved through linking the chemical analysis obtained by LA-ICP-MS with all the EPR spectra observed for commercial and synthesized glasses as well as the evolution of the spectral shapes with annealing temperature and microwave power for the different samples. For GG5 & SPs, two hole centers (HC1 and HC2 point defects) were attributed constituting the radio-induced signal. In addition, a signal due to zirconium (Zr3+) and/or titanium (Ti3+) ions was observed following UV and also for X-rays irradiation at doses above 100 Gy. For GG7, a signal due to Mn2+ ions was observed prior and post irradiation that complexifies GG7’s overall analysis. Nevertheless, we identified in the complex signal phosphorous oxygen hole center (POHC) and (Zn2+)- (Electron Center) point defects along with a signal due to Ti3+ ions. Furthermore, a high certainty of aluminum oxygen hole center (AlOHC) point defect was concluded. Additionally, UV-B exposure was determined not to be a confounding or a limiting factor for both Gorilla® glass and SP under investigation, as for previous generation. Some variability studies were performed for GG5, GG7 & SPs providing an optimistic insight into results’ generalization. Testing more samples is a prospective of the thesis along with the simulation of the EPR signals for possible quantification of the identified point defects. The dose response were studied for GG5 and SP using a field deployable benchtop EPR spectrometer to provide a first evaluation of practical performance for expertise on the field. The minimum detection limits are determined to be 750 and 1353 mGy, respectively with no spectra processing. Due to the high complexity of EPR spectra of GG7, the dose response of the Zn signal was studied by an advanced EPR spectrometer with a minimum detection limit of 979 mGy. These results indicate that the proposed approach could provide an initial categorization of victims (>2 Gy, >4Gy) enabling prioritization of access to medical care. Further work will be required for additional testing of the variability of samples characteristics and optimizing the signal measurement and analysis to improve performances. This work is a promising first step towards an automatic and operational approach for triage in the case of large-scale accidents scenarios.
• Fs-laser-produced nanostructures for Advanced Magnetic, Acoustic, and Plasmonic Applications
  
  • Varlamov Pavel
  , 2024. Femtosecond (fs) laser pulses have become a standard tool for the localized modification of materials, enabling surface functionalization, nanofabrication, and investigations of material properties through techniques like ultrafast laser spectroscopy. However, such studies are often conducted separately, limiting the discovery of intriguing physical properties in laser-fabricated materials.This thesis presents a comprehensive approach to all-optical investigations that integrate laser nanofabrication with advanced nano-optical techniques, including superresolution interferometry, ultrafast scanning acoustic microscopy, and magneto-plasmonic microscopy. At the heart of fs-laser modification are non-equilibrium thermal processes, which typically result in material destruction and removal through ablation. Remarkably, when applied to a complex compound like FeRh, fs-laser ablation was found to induce magnetic phase switching. This phenomenon was explored in detail using magneto-optical microscopy.For various applications, structures with predictable and finely tuned properties are crucial, necessitating nanometer precision and well-defined material characteristics. A non-destructive alternative to ablation is fs-laser spallation, which primarily operates through the generation of intense ultrafast acoustic pulses, which require significantly less energy for nanostructuring than ablation. Spallation leads to the separation or delamination of thin films from their substrate when the material is irradiated from the substrate side. In this work, fs-laser nanostructuring was applied to ferromagnetic layers and multilayers. To characterize the resulting structures, a superresolution interferometer was developed, reaching the Abbe diffraction limit. This setup allowed us to observe gaps ranging from nanometers to submicrometers on both sides of the fabricated structures without requiring their destruction.The fabricated structures were then subjected to further investigation to assess their properties. First, we examined the ultrafast acoustic dynamics in delaminated 100 nm thick Ni and Fe films. To achieve this, a custom optical setup was built, enabling the study of ultrafast acoustic dynamics with microscopic lateral resolution. The results revealed the confinement of acoustic pulses within the delaminated films, compared to the behavior in films still attached to the substrate. Separate acoustic modes were identified, with frequencies reaching 100–200 GHz.Another noteworthy application explored in this thesis is magneto-plasmonics. Laser-induced spallation creates a vacuum nanogap, transforming the thin film into an additional layer. This substrate-vacuum-film configuration was shown to excite surface plasmon-polaritons (SPPs) in an Otto configuration. Experimental results on a 100 nm Au / 200 nm Co bilayer with a 550 nm gap demonstrated the excitation of SPPs. A magneto-plasmonic microscope was developed for these measurements, revealing enhanced magneto-optical signals due to SPP excitation, with the data fitting well with theoretical predictions.As a result, this work demonstrates the feasibility of nondestructive fs-laser nanostructuring of ferromagnetic multilayers and highlights their potential applications in acousto-magneto-plasmonics via all-optical methods. These findings hold significant promise for advancing the field of magneto-acoustics, as freestanding delaminated films are expected to enhance magnon modes through phonon-magnon interactions reahing the THz frequency range. Additionally, the field of magnetism can benefit from structures designed for curvature magnetism, where laser spallation offers new possibilities in nanofabrication. Notably, fs-laser spallation is not limited to ferromagnetic or metallic materials; it can also be applied to semiconductors and 2D and 3D materials, expanding its potential for emerging applications.
• In‐Plane Chirality Control of a Charge Density Wave by Means of Shear Stress
  
  • Qi Weiyan
  • Ponzoni Stefano
  • Huitric Guénolé
  • Grasset Romain
  • Laplace Yannis
  • Cario Laurent
  • Zobelli Alberto
  • Marsi Marino
  • Papalazarou Evangelos
  • Alekhin Alexandr
  • Gallais Yann
  • Bendounan Azzedine
  • Sung Suk Hyun
  • Schnitzer Noah
  • Goodge Berit Hansen
  • Hovden Robert
  • Perfetti Luca
  Advanced Materials, Wiley-VCH Verlag, 2024. The transition metal dichalcogenide 1T‐TaS 2 exhibits a Charge Density Wave (CDW) with in‐plane chirality. Due to the rich phase diagram, the Ferro‐Rotational Order (FRO) can be tuned by external stimuli. The FRO is studied by Angle‐Resolved Photoelectron Spectroscopy (ARPES), Raman spectroscopy, and Selected Area Electron Diffraction (SAED). The in‐plane chirality of the CDW is lost at the transition from Nearly‐Commensurate (NC) to In‐Commensurate (IC) phase and can be controlled by applying shear stress to the sample while cooling it through the transition from IC‐CDW to NC‐CDW. Based on these observations, a protocol is proposed to achieve reliable, non‐volatile state switching of the FRO configuration in 1T‐TaS 2 bulk crystals. These results pave the way for new functional devices in which in‐plane chirality can be set on demand. (10.1002/adma.202410950)
  DOI : 10.1002/adma.202410950
• Piezoelectric polymer generators: The large bending regime
  
  • Sarrey E.
  • Sigallon M C
  • Clochard M.-C.
  • Wegrowe J.-E.
  • Hamon A.-L.
  Journal of Applied Physics, American Institute of Physics, 2024, 136, pp.184502. There is an important difference between piezoelectric polymer films and solid crystals for the application of piezoelectric generators. In the case of polymers, the optimal piezoelectric response imposes a large bending regime. Starting from the linear Curie’s constitutive equations, we develop an analytical model under the assumption of the large bending regime resulting from bulge testing configuration. This model shows a specific non-linear piezoelectric response, which follows a power of 2/3 of the mechanical excitation. The piezoelectric voltage and the corresponding power are then studied experimentally as a function of the angular frequency ω of the mechanical excitation, the load resistance R, and the thickness of the film ℓ. The experimental results carried out on piezoelectric polyvinylidene fluoride (PVDF) films validate the model. (10.1063/5.0234238)
  DOI : 10.1063/5.0234238
• H2 production mechanisms in irradiated portlandite: surface and volume contributions
  
  • Herin Thibaut
  • Alessi Antonino
  • Poyet Stéphane
  • Bouniol Pascal
  • Le Caër Sophie
  Journal of Physical Chemistry C, American Chemical Society, 2024. Calcium hydroxide or portlandite (Ca(OH)2) is the second most abundant hydrate in cementitious materials. The latter form the basis of the coating matrices of some forms of radioactive waste. Under ionizing radiation, this results in the production of radiolytic molecular hydrogen, which, when it accumulates in the environment, may raise safety concerns. It is important, therefore, to understand how radiation interacts with these materials, and especially with portlandite. This hydroxide is of particular interest: on exposure to irradiation, it not only leads to the immediate production of molecular hydrogen but also to a delayed production over long periods of time (days or even weeks) after the irradiation stops. It follows that it is important to determine the reaction mechanisms operating in this system. This was carried out here based on experiments with electron paramagnetic resonance spectroscopy, which identified the different radicals generated under radiation. As a result, we have been able to show that the immediate production of H2 is due to the stabilization of electrons on the surface of the portlandite, followed by surface reactions that encourage the immediate release of H2 into the gaseous atmosphere. When the dose increases, the number of these sites drops, leading to a fall in the production of the molecular hydrogen immediately released. The delayed production of H2 is due to the formation of hydrogen atoms followed by their dimerization within the portlandite crystal lattice, with the result that the molecular hydrogen molecules are trapped. In this case, the movement of the hydrogen atoms in the crystal lattice sets the CaO• radicals in motion. At low doses, these radicals dimerize to form CaO-OCa peroxides. At higher doses, the CaO• radicals can react with hydrogen atoms, which restricts the formation of the trapped H2. The range of different reaction intermediates identified reflects the richness of the chemical processes involved in the mechanisms, which accounts for the behavior of portlandite on exposure to irradiation. (10.1021/acs.jpcc.4c05914)
  DOI : 10.1021/acs.jpcc.4c05914
• Electronic Band Structure of a Superconducting Nickelate Probed by the Seebeck Coefficient in the Disordered Limit
  
  • Grissonnanche Gaël
  • Pan G. A.
  • Labollita H.
  • Segedin D. Ferenc
  • Song Q.
  • Paik H.
  • Brooks C. M.
  • Beauchesne-Blanchet E.
  • Santana González J. L.
  • Botana A. S.
  • Mundy J. A.
  • Ramshaw B. J.
  Physical Review X, American Physical Society, 2024, 14 (4), pp.041021. Superconducting nickelates are a new family of strongly correlated electron materials with a phase diagram closely resembling that of superconducting cuprates. While analogy with the cuprates is natural, very little is known about the metallic state of the nickelates, making these comparisons difficult. We probe the electronic dispersion of thin-film superconducting five-layer ( n = 5 ) and metallic three-layer ( n = 3 ) nickelates by measuring the Seebeck coefficient S . We find a temperature-independent and negative S / T for both n = 5 and n = 3 nickelates. These results are in stark contrast to the strongly temperature-dependent S / T measured at similar electron filling in the cuprate La 1.36 Nd 0.4 Sr 0.24 CuO 4 . The electronic structure calculated from density-functional theory can reproduce the temperature dependence, sign, and amplitude of S / T in the nickelates using Boltzmann transport theory. This demonstrates that the electronic structure obtained from first-principles calculations provides a reliable description of the fermiology of superconducting nickelates and suggests that, despite indications of strong electronic correlations, there are well-defined quasiparticles in the metallic state. Finally, we explain the differences in the Seebeck coefficient between nickelates and cuprates as originating in strong dissimilarities in impurity concentrations. Our study demonstrates that the high elastic scattering limit of the Seebeck coefficient reflects only the underlying band structure of a metal, analogous to the high magnetic field limit of the Hall coefficient. This opens a new avenue for Seebeck measurements to probe the electronic band structures of relatively disordered quantum materials. Published by the American Physical Society 2024 (10.1103/PhysRevX.14.041021)
  DOI : 10.1103/PhysRevX.14.041021
• Planar Thermal Hall Effect from Phonons in Cuprates
  
  • Chen Lu
  • Le Roux Léna
  • Grissonnanche Gaël
  • Boulanger Marie-Eve
  • Thériault Steven
  • Liang Ruixing
  • Bonn D. A.
  • Hardy W. N.
  • Pyon S.
  • Takayama T.
  • Takagi H.
  • Xu Ke-Jun
  • Shen Zhi-Xun
  • Taillefer Louis
  Physical Review X, American Physical Society, 2024, 14 (4), pp.041011. A surprising “planar” thermal Hall effect, whereby the field is parallel to the current, has recently been observed in a few magnetic insulators; this effect has been attributed to exotic excitations such as Majorana fermions or chiral magnons. Here, we investigate the possibility of a planar thermal Hall effect in three different cuprate materials, in which the conventional thermal Hall conductivity κ xy (with an out-of-plane field perpendicular to the current) is dominated by either electrons or phonons. Our measurements show that the planar κ xy from electrons in cuprates is zero, as expected from the absence of a Lorentz force in the planar configuration. By contrast, we observe a sizable planar κ xy in those samples where the thermal Hall response is due to phonons, even though it should, in principle, be forbidden by the high crystal symmetry. Our findings call for a careful reexamination of the mechanisms responsible for the phonon thermal Hall effect in insulators. Published by the American Physical Society 2024 (10.1103/PhysRevX.14.041011)
  DOI : 10.1103/PhysRevX.14.041011
• Temperature Induced, Reversible Switching of Ferro-Rotational Order Coupled to Superlattice Commensuralibity
  
  • Qi Weiyan
  • Dong Jingwei
  • Ponzoni Stefano
  • Huitric Guénolé
  • Grasset Romain
  • Laplace Yannis
  • Cario Laurent
  • Marsi Marino
  • Papalazarou Evangelos
  • Zobelli Alberto
  • Alekhin Alexandr
  • Gallais Yann
  • Bendounan Azzedine
  • Perfetti Luca
  Nano Letters, American Chemical Society, 2024, 24 (42), pp.13134-13139. (10.1021/acs.nanolett.4c02546)
  DOI : 10.1021/acs.nanolett.4c02546
• Lifting of Gap Nodes by Disorder in Tetragonal FeSe$_{1−x}$S$_x$ Superconductors
  
  • Nagashima T.
  • Ishihara K.
  • Imamura K.
  • Kobayashi M.
  • Roppongi M.
  • Matsuura K.
  • Mizukami Y.
  • Grasset R.
  • Konczykowski M.
  • Hashimoto K.
  • Shibauchi T.
  Physical Review Letters, American Physical Society, 2024, 133 (15), pp.156506. The observation of time-reversal symmetry breaking and large residual density of states in tetragonal FeSe1-s Sx suggests a novel type of ultranodal superconducting state with Bogoliubov Fermi surfaces (BFSs). Although such BFSs in centrosymmetric superconductors are expected to be topologically protected, the impurity effect of this exotic superconducting state remains elusive experimentally. Here, we investigate the impact of controlled defects introduced by electron irradiation on the superconducting state of tetragonal FeS1-xSx (0.18 < x < 0.25). The temperature dependence of magnetic penetration depth is initially consistent with a model with BFSs in the pristine sample. After irradiation, we observe a non-monotonic evolution of low-energy excitations with impurity concentrations. This nonmonotonic change indicates a transition from nodal to nodeless, culminating in gapless with Andreev bound states, reminiscent of the nodal s+/- case. This points to the accidental nature of the possible BFSs in tetragonal FeSe1-xSx, which are susceptible to disruption by the disorder. (10.1103/PhysRevLett.133.156506)
  DOI : 10.1103/PhysRevLett.133.156506
• Controlled disorder-induced peak effect in the single-crystalline Ca$_{3}$ Rh$_{4}$Sn$_{13}$ superconductor
  
  • Ghimire Sunil
  • Joshi Kamal
  • Krenkel Elizabeth
  • Kończykowski Marcin
  • Grasset Romain
  • Tanatar Makariy
  • Chen Shuzhang
  • Petrovic Cedomir
  • Prozorov Ruslan
  Physical Review B, American Physical Society, 2024, 110 (10), pp.104521. (10.1103/PhysRevB.110.104521)
  DOI : 10.1103/PhysRevB.110.104521
• Dose rate effects in Ag-doped metaphosphate glass RPL dosimeters up to MGy range
  
  • Aguiar Y.
  • Garcia R.
  • Kranjcevic M.
  • Ferrari Matteo.
  • Soderstrom D.
  • Mandal A. Raj
  • Gascon J.
  • Trummer J.
  • Vincke H.
  • Alessi A.
  • Cavani O.
  • Costantino A.
  • Lerner G.
  • Girard S.
  , 2024.
• Femtosecond laser ablation and delamination of functional magnetic multilayers at the nanoscale
  
  • Varlamov Pavel
  • Marx Jan
  • Elgueta Yoav Urbina
  • Ostendorf Andreas
  • Kim Ji-Wan
  • Vavassori Paolo
  • Temnov Vasily
  Nanomaterials, MDPI, 2024, 14 (18), pp.1488. Laser nanostructuring of thin films with ultrashort laser pulses is widely used for nanofabrication across various fields. A crucial parameter for optimizing and understanding the processes underlying laser processing is the absorbed laser fluence, which is essential for all damage phenomena such as melting, ablation, spallation, and delamination. While threshold fluences have been extensively studied for single compound thin films, advancements in ultrafast acoustics, magnetoacoustics, and acousto-magneto-plasmonics necessitate understanding the laser nanofabrication processes for functional multilayer films. In this work, we investigated the thickness dependence of ablation and delamination thresholds in Ni/Au bilayers by varying the thickness of the Ni layer. The results were compared with experimental data on Ni thin films. Additionally, we performed femtosecond time-resolved pump-probe measurements of transient reflectivity in Ni to determine the heat penetration depth and evaluate the melting threshold. Delamination thresholds for Ni films were found to exceed the surface melting threshold suggesting the thermal mechanism in a liquid phase. Damage thresholds for Ni/Au bilayers were found to be significantly lower than those for Ni and fingerprint the non-thermal mechanism without Ni melting, which we attribute to the much weaker mechanical adhesion at the Au/glass interface. This finding suggests the potential of femtosecond laser delamination for nondestructive, energy-efficient nanostructuring, enabling the creation of high-quality acoustic resonators and other functional nanostructures for applications in nanosciences. (10.3390/nano14181488)
  DOI : 10.3390/nano14181488
• Occurrence of the collective Ziman limit of heat transport in cubic semiconductors Si, Ge, AlAs and AlP: scattering channels and size effects
  
  • Sjakste Jelena
  • Markov Maxime
  • Sen Raja
  • Fugallo Giorgia
  • Paulatto Lorenzo
  • Vast Nathalie
  Nano Express, 2024, 5 (3), pp.035018. In this work, we discuss the possibility of reaching the Ziman conditions for collective heat transport in cubic bulk semiconductors, such as Si, Ge, AlAs and AlP. In natural and enriched silicon and germanium, the collective heat transport limit is impossible to reach due to strong isotopic scattering. However, we show that in hyper-enriched silicon and germanium, as well as in materials with one single stable isotope like AlAs and AlP, at low temperatures, normal scattering plays an important role, making the observation of the collective heat transport possible. We further discuss the effects of sample sizes, and analyse our results for cubic materials by comparing them to bulk bismuth, in which second sound has been detected at cryogenic temperatures. We find that collective heat transport in cubic semiconductors studied in this work is expected to occur at temperatures between 10 and 20 K. (10.1088/2632-959X/ad70cf)
  DOI : 10.1088/2632-959X/ad70cf
• Friction mechanisms of Ni-based and Zr-based bulk metallic glasses under different contact pressures
  
  • Zhou Zhijian
  • Albahrani Sayed
  • Ren Yue
  • Daudin Rémi
  • Lafarge Lionel
  • Ollier Nadège
  • Homeyer Estelle
  • Saulot Aurélien
  • Descartes Sylvie
  • Tanguy Anne
  Tribology International, Elsevier, 2024, 197, pp.109763. (10.1016/j.triboint.2024.109763)
  DOI : 10.1016/j.triboint.2024.109763
• LaNi5 intermetallic both as catalyst and storage compound for in situ hydrogen generation from water under visible light irradiation
  
  • Amouyal Edmond
  , 2024. The intermetallic compound LaNi5 has been shown both to catalyze, under visible light irradiation, the in situ photogeneration of hydrogen from water in a model system using Ru(bpy)3 2+ as a photosensitizer, and to partially store the hydrogen so produced in the form of a hydride LaNi5Hx. The stored hydrogen can be easily released by moderate heating of the hydride. This leads to the regeneration of the catalyst that can be used again for another cycle of catalysis – partial storage – hydrogen desorption.
• Thermodynamical stability of carbon-based defects in α boron from first principles
  
  • Cho Yeonsoo
  • Sjakste Jelena
  • Hardouin Duparc Olivier
  • Vast Nathalie
  Solid State Sciences, Elsevier, 2024, 154, pp.107610. We report an exhaustive study of the formation enthalpy and charge states of carbon-based defects in rhombohedral α boron within the density functional theory (DFT) that enables us to derive rules about the formation of complex carbon defects. We have accounted for one and two interstitial carbon atoms, eventually combined with one substitutional carbon atom and/or one interstitial boron atom and varied several geometric parameters. We find that when positioned in the plane perpendicular to the [111] rhombohedral axis, two carbon atoms turn out to preferentially form a graphite-like hexagon with four boron atoms. When positioned instead along the [111] axis, the distance between them strongly affects the defect thermodynamic stability, and we find in particular that additional negative charges strongly stabilize the diatomic carbon–carbon chains. (10.1016/j.solidstatesciences.2024.107610)
  DOI : 10.1016/j.solidstatesciences.2024.107610
• Role of magnetic ions in the thermal Hall effect of the paramagnetic insulator TmVO 4
  
  • Vallipuram Ashvini
  • Chen Lu
  • Campillo Emma
  • Mezidi Manel
  • Grissonnanche Gaël
  • Boulanger Marie-Eve
  • Lefrançois Étienne
  • Zic Mark
  • Li Yuntian
  • Fisher Ian
  • Baglo Jordan
  • Taillefer Louis
  Physical Review B, American Physical Society, 2024, 110 (4), pp.045144. (10.1103/PhysRevB.110.045144)
  DOI : 10.1103/PhysRevB.110.045144
• Optical quality improvement of ZnGeP2 crystals
  
  • Vernozy Charlotte
  • Alessi Antonino
  • Petit Johan
  • Courpron Audrey
  • Véniard Valérie
  , 2024.
• 4D Printing of Multifunctional Devices Induced by Synergistic Role of Magnetite and Silver Nanoparticles in Polymeric Nanocomposites
  
  • Cosola Andrea
  • Roppolo Ignazio
  • Frascella Francesca
  • Napione Lucia
  • Barrera Gabriele
  • Tiberto Paola
  • Turbant Florian
  • Arluison Véronique
  • Caldelari Isabelle
  • Mercier Noémie
  • Castellino Micaela
  • Aubrit Florian
  • Rizza Giancarlo
  Advanced Functional Materials, Wiley, 2024, 34 (41). Emerging as a revolutionary strategy to fabricate dynamic three dimesional (3D) structures, 4D printing (4DP) mainly refers to printed materials capable of changing form over time when exposed to a predetermined stimulus. Nevertheless, the 4D concept can be extended beyond shape-morphing, by including also changes in the properties and/or functionalities of printed materials over time. To this end, this work explores the 4DP of multifunctional nanocomposites that can adapt to different application scenarios exploiting the stimuli-activable properties of two functional nanofillers embedded into the polymeric matrix. In particular, a photocurable system loaded with both Fe 3 O 4 nanoparticles (NPs) and AgNO 3 , as precursors for the in situ photo-induced generation of Ag NPs, is used for the digital light processing of magnetic nanocomposites with integrated electrical and antibacterial functions. The composition of formulations is designed to both optimize their printability and maximize the magneto-responsiveness and the electrical conductivity and/or antibacterial activity of the printed objects, given by Fe 3 O 4 and Ag NPs, respectively. Finally, it is shown that the functional responses of the nanocomposites can be activated individually or in combination, which may be of particular interest for the fabrication of smart multifunctional devices with potential applications ranging from soft electronics to biomedicine. (10.1002/adfm.202406226)
  DOI : 10.1002/adfm.202406226
• Power efficiency of Hall-like devices: Comparison between reciprocal and antireciprocal Onsager relations
  
  • Wegrowe Jean-Eric
  • Zhou Luqian
  • Al Saati Sariah
  Physical Review B, American Physical Society, 2024, 110 (2), pp.024412. Two well-known Hall-like effects occur in ferromagnets: the anomalous Hall effect (AHE) and the planar Hall effect (PHE). AHE is analogous to the classical Hall effect and is characterized by the antireciprocal Onsager relation (antisymmetric conductivity matrix), whereas PHE is defined by the reciprocal Onsager relation (symmetric conductivity matrix). The distinction is fundamental, as it stems from time-reversal symmetry breaking at the microscopic scale. We examine theoretically the Hall current generated in both AHE and PHE, along with the electric power that can be transferred from the edges of the Hall bar into a load circuit. Using a variational method based on the second law of thermodynamics, we derive expressions for the distribution of the electric currents, the distribution of electric carriers, and the power efficiencies. Our results show that the distribution of the transverse Hall current is identical for both AHE and PHE (with all other parameters being equals) but the longitudinal current and the power dissipated differ at the second order in the Hall angle. (10.1103/PhysRevB.110.024412)
  DOI : 10.1103/PhysRevB.110.024412
• Analysis of New Measurements of 18O-substituted Isotopic Species 16O16O18O and 16O18O16O of Ozone in the THz and Far-Infrared Ranges
  
  • Starikova E.
  • Barbe Alain
  • Manceron L.
  • Grouiez B.
  • Burgalat J.
  • Tyuterev V.
  Atmospheric and Oceanic Optics, Springer, 2024, 37 (2), pp.132-141. Abstract High-resolution spectra corresponding to the rotational and the ν 2 –ν 2 bands of the two most abundant isotopic species of ozone with one heavy 18 O oxygen atom were recorded using SOLEIL synchrotron radiation source in the range 30–200 cm −1 . Additionally, the ν 2 vibrational-rotational bands were recorded between 550 and 880 cm −1 using a classical glowbar source that made it possible to extend and refine information compared to published data on the observed transitions of these bands. The analyses of recorded spectra permitted us to deduce experimental set of energy levels for the ground (000) and the first bending (010) vibrational states, which significantly exceeds literature data in terms of rotational quantum numbers. For both isotopic species, the weighted fits of all experimental line positions were carried out including previously published microwave data. As a result of this work, the improved values of rotational and centrifugal distortion parameters for the states (000) and (010) were obtained that permitted modelling the experimental line positions with a weighted standard deviation of 1.284 (2235 transitions) and 0.908 (4597 transitions), respectively, for 16 O 16 O 18 O, and 1.168 (824 transitions) and 1.724 (2381 transitions) for 16 O 18 O 16 O. (10.1134/S1024856024700167)
  DOI : 10.1134/S1024856024700167
• Photon emission and radiation reaction effects in surface plasma waves in ultra-high intensities
  
  • Kleij P.
  • Marini S.
  • Caetano de Sousa M.
  • Grech M.
  • Riconda C.
  • Raynaud M.
  Physics of Plasmas, American Institute of Physics, 2024, 31 (7). Manipulating and harnessing plasmonic phenomena in the ultra-relativistic regime reveal promising prospects for the use of surface plasma waves (SPW) to create high-energy particle and radiation sources in the next generation of multi-petawatt lasers. Indeed, relativistic high-charge electron bunches can be produced by SPW excited by ultra-high intensity femtosecond lasers impinging on a periodically modulated solid-density target. In this regime, there is good evidence that SPW excitation survives and that the produced electron bunches experience strong acceleration, thus emitting large amounts of electromagnetic radiation. Therefore, extending the study to ultra-high laser intensities (I&gt;1021 W/cm2), the use of a resonant grating for SPW generation represents an interesting alternative to light sources, as the energy lost by electrons due to radiation emission is transferred to high-energy γ photons. In addition, we show that using a laser with wavefront rotation coupled with a tailored blazed grating improves photon emission in the ultra-relativistic regime of interaction. (10.1063/5.0209316)
  DOI : 10.1063/5.0209316
• Hydration in diluted solutions of brownmillerite extracted from SR cement and synthetic brownmillerite
  
  • Mériot Alexis
  • Gauffinet sandrine
  • de Noirfontaine Marie-Noëlle
  • Courtial Mireille
  • Alloncle Karen
  • Izoret Laurent
  • Dunstetter Frédéric
  Cement and Concrete Research, Elsevier, 2024, 181, pp.107518. The aim of this study is to investigate the reactivity of ferrites extracted from Sulfate Resisting (SR) Portland cement clinkers, until now often neglected. Industrial materials and synthetic materials have been studied and compared in the whole range of the Al/Fe ratio. Highly diluted aqueous suspensions were used, ranging between pure water and more complex solutions simulating the pore solution in cement. Conductimetry was combined with ICP. The reactivity of ferrite depends on the environment and the aluminum content of ferrite. The reactivity of ferrites extracted from industrial SR0 and SR3 clinkers (C3A = 0 wt% and C3A ≤ 3 wt% respectively) can be distinguished from one another. Additionally, industrial ferrite was found to be more reactive than synthetic ferrite. The iron content of katoite and ettringite was investigated using XRD. It depends on the Al/Fe ratio of ferrite and the presence of calcium hydroxide in the solution. (10.1016/j.cemconres.2024.107518)
  DOI : 10.1016/j.cemconres.2024.107518
• Assessing Pozzolanic Reactivity of Reclaimed Fired Clay Roof Tiles and Bricks in Presence of Ground Limestone
  
  • Guillaume Bernadin
  • Serbource Théodore
  • Gauffinet sandrine
  • de Noirfontaine Marie-Noëlle
  • Izoret Laurent
  , 2024, 362, pp.783-793. Due to the drastic necessity to reduce cement and binder carbon footprint and because of the increasing scarcity of traditional supplementary cementitious material, there is an increasing interest in non-traditional reactive materials with low CO2 footprint, eventually coming from the circular economy. There are several emerging opportunities that need to be investigated before confirming their aptitude to substitute clinker, alone or in combination with other materials. Among these opportunities, reclaimed fired clay roof tiles and bricks represent a good candidate not only because they were historically used by the antic Romans but also because they represent a significant part of demolition wastes. These materials, gathered from different locations in France with different ages, were chemically and mineralogically characterized. Their potential pozzolanic character was assessed by mean of R3 tests with a follow-up of the evolution of hydrates suite (consumption and precipitation), doubled with mechanical strength on mortar for different formulated binders, combining materials to simulate standardized cement types according to European standards EN197-1 and -5. The overall results indicate their reactivity was good enough to conclude that these materials can be considered as potential alternative SCMs. (10.14359/51742009)
  DOI : 10.14359/51742009