A5068565862- 2D Materials and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Molecular spectroscopy and chirality
- Advanced Condensed Matter Physics
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- Multiferroics and related materials
- Lanthanide and Transition Metal Complexes
- High-pressure geophysics and materials
- Porphyrin and Phthalocyanine Chemistry
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Geophysical and Geoelectrical Methods
- Nanowire Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Semiconductor materials and interfaces
- Electron Spin Resonance Studies
- Advancements in Semiconductor Devices and Circuit Design
- Synthesis and Properties of Aromatic Compounds
- Magnetic properties of thin films
Centre National de la Recherche Scientifique
2014-2024
Laboratoire National des Champs Magnétiques Intenses
2012-2024
Institut National des Sciences Appliquées de Toulouse
2019-2024
Université Grenoble Alpes
2016-2024
Université Joseph Fourier
2014
European Synchrotron Radiation Facility
2007
Semiconducting transition metal dichalcogenides (TMDCs) give rise to interesting new phenomena in external magnetic fields, such as valley Zeeman splitting and magnetic-field-induced polarization. These effects have been reported for monolayers (MLs) of the diselenides MoSe2 WSe2 and, more recently, disulfides MoS2 WS2. Here, we present helicity-resolved magneto-photoluminescence magneto-reflectance contrast measurements MLs telluride member semiconducting TMDCs, 2H-MoTe2, fields up 29 T...
Here we report the first experimental observation of magneto-chiral dichroism (MChD) detected through light absorption in an enantiopure lanthanide complex. The P and M enantiomers [YbIII((X)-L)(hfac)3] (X = P, M; L 3-(2-pyridyl)-4-aza[6]-helicene; hfac 1,1,1,5,5,5-hexafluoroacetylacetonate), where chirality is held by helicene-based ligand, were studied near-infrared spectral window. When irradiated with unpolarized a magnetic field, these chiral complexes exhibit strong MChD signal (gMChD...
Here, we report the molecular self-assembly of hydroxido-bridged {Ln5Ni6} ((Ln3+ = Dy3+, Y3+) metal clusters by reaction enantiopure chiral ligands, namely, (R/S)-(2-hydroxy-3-methoxybenzyl)-serine), with NiII and LnIII precursors. Single-crystal diffraction analysis reveals that these compounds are isostructural sandwich-like 3d–4f heterometallic showing helical chirality. Direct current magnetic measurements on {Dy5Ni6} indicates ferromagnetic coupling between DyIII centers, whereas those...
Here we report on the strong magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption up to 5.0 T {Er5Ni6} metal clusters obtained by reaction of enantiopure chiral ligands NiII ErIII precursors. Single-crystal diffraction analysis reveals that these compounds are 3d–4f heterometallic clusters, showing helical chirality. MChD spectroscopy a high gMChD dissymmetry factor ca. 0.24 T–1 (T = 4.0 K, B 1.0 T) for 4I13/2 ← 4I15/2 magnetic-dipole allowed electronic...
Optical magneto-spectroscopy methods (Raman scattering, far-infrared transmission, and photoluminescence) have been applied to investigate the properties of ${\mathrm{NiPS}}_{3}$ semiconducting antiferromagnet. The fundamental magnon gap excitation in this van der Waals material has found be split into two components, support biaxial character Photoluminescence measurements near-infrared spectral range show that intriguing 1.475 eV unique antiferromagnetic phase splits upon application...
Magnetic materials are widely used for many technologies in energy, health, transportation, computation, and data storage. For the latter, readout of magnetic state a medium is crucial. Optical based on magneto-optical Faraday effect was commercialized but soon abandoned because need complex circular polarization-sensitive readout. Combining chirality with magnetism can remove this obstacle, as chiral exhibit magneto-chiral dichroism, differential absorption unpolarized light dependent their...
A new experimental station at ESRF beamline ID20 is presented which allows magnetic and resonant X-ray scattering experiments in the energy range 3-25 keV to be performed under extreme conditions. High field up 10 T, high pressure 30 kbar combined with low temperatures down 1.5 K are available can M-edges of actinide elements, L-edges lanthanides K-edges transition metals.
Here we report on magneto-chiral dichroism (MChD) detected with visible light the chiral Prussian Blue Analogue [MnII(X-pnH)(H2O)][CrIII(CN)6]·H2O (X = S, R; pn 1,2-propanediamine). Single crystals suitable for magneto-optical measurements were grown starting from enantiopure ligands. X-ray diffraction and magnetic confirmed 2D-layered structure of material, its absolute configuration, ferrimagnetic ordered state below a critical temperature TC 38 K. Absorption MChD spectra measured between...
Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work, we investigate the magnetization process a biaxial antiferromagnet in an external field along easy axis. We find single metamagnetic transition Ising type observed material under ambient transforms into two transitions, first-order spin-flop followed by...
Achieving significant doping in GaAs/AlAs core/shell nanowires (NWs) is of considerable technological importance but remains a challenge due to the amphoteric behavior dopant atoms. Here we show that placing narrow GaAs quantum well AlAs shell effectively getters residual carbon acceptors leading an \emph{unintentional} p-type doping. Magneto-optical studies such core multi-shell NW reveal confined emission. Theoretical calculations electronic structure confirm confinement carriers at...
Magnetochiral dichroism (MChD) is a nonreciprocal manifestation of light-matter interaction that can be observed in chiral magnetized systems. It features differential absorption unpolarized light depending on the relative orientation magnetic field and wavevector absolute configuration system. The relevance this effect for optical readout data calls complete understanding microscopic parameters driving MChD with an easy-accessible nondamaging source, such as visible light. For purpose, here...
Here we report magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption of a chiral dysprosium(III) coordination polymer. The two enantiomers [DyIII(H6(py)2)(hfac)3]n [H6(py)2 = 2,15-bis(4-pyridyl)ethynylcarbo[6]helicene; hfac- 1,1,1,5,5,5-hexafluoroacetylacetonate], where the chirality is provided by functionalized helicene ligand, were structurally, spectroscopically, magnetically investigated. Magnetic measurements reveal slow relaxation magnetization,...
The union between magnetism and chirality is finally validated.
Magnon gap excitations selectively coupled to phonon modes have been studied in ${\mathrm{FePSe}}_{3}$ layered antiferromagnet with magneto-Raman-scattering experiments performed at different temperatures. The bare magnon excitation this material has found be split (by $\ensuremath{\approx}1.2\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$) into two components each being one of the degenerate, nearby modes. Lifting degeneracy fundamental mode points out toward biaxial character...
The optical and magneto-chiral properties of a 3D chiral molecular ferrimagnet based on Cr III Mn II building blocks have been investigated to unveil the role structural dimensionality dichroism.
Abstract Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe 3 . Experiments carried out as a function of temperature and applied magnetic field show that two low-energy branches its antiferromagnetic phase are gapped. The observation gaps (at 1.70 ± 0.05 meV 0.09 0.01 meV) implies is biaxial antiferromagnet. A relatively strong out-of-plane anisotropy imposes spin alignment be in-plane whereas directionality within plane governed by...
The authors unveil here new findings in the realm of phase transitions VO${}_{2}$ single crystals, all achieved under hydrostatic pressure conditions. They provide experimental results, exploiting observation soft phonons through Raman spectroscopy and high-quality structural refinements. These offer a fresh perspective on diagrams, including precise description M${}_{1}$-M${}_{1}^{\ensuremath{'}}$ isostructural transition occurring at staggering 14 GPa. study also reveals that isothermal...
Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work we investigate the magnetization process a biaxial antiferromagnet in an external field along easy axis. We find single metamagnetic transition Ising type observed material under ambient transforms into two transitions, first-order spin flop followed by second order...
We present an experimental setup developed to perform optical spectroscopy experiments (Raman scattering and photoluminescence measurements) with a micrometer spatial resolution in extreme environment of low temperature, high magnetic field, pressure. This unique setup, the best our knowledge, allows us deeply explore phase diagram condensed matter systems by independently tuning these three thermodynamic parameters while monitoring low-energy excitations (electronic, phononic, or...
A magneto-optical study of the $1.4$-eV Ni color center in boron-free synthetic diamond, grown at high pressure and temperature, has been performed magnetic fields up to 56 T. The data are interpreted using effective spin Hamiltonian Nazar\'e, Nevers, Davies [Phys. Rev. B 43, 14196 (1991)] for interstitial Ni${}^{+}$ with electronic configuration $3{d}^{9}$ $S=1/2$. Our results unequivocally demonstrate trigonal symmetry defect, which preferentially aligns along [111] growth direction on...
Magnon gap excitations selectively coupled to phonon modes have been studied in FePSe$_3$ layered antiferromagnet with magneto-Raman scattering experiments performed at different temperatures. The bare magnon excitation this material has found be split (by $\approx~1.2$ cm$^{-1}$) into two components each being one of the degenerated, nearby modes. Lifting degeneracy fundamental mode points out toward biaxial character FePS$_3$ antiferromagnet, an additional in-plane anisotropy complementing...
Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe$_3$. Experiments carried out as a function of temperature and applied magnetic field show that two low-energy branches MnPSe$_3$ its antiferromagnetic phase are gapped. The observation gaps (at 14 0.7 cm$^{-1}$) implies is biaxial antiferromagnet. A relatively strong out-of-plane anisotropy imposes spin alignment be in-plane whereas directionality within plane governed by factor 2.5...