A5032345819- Rare-earth and actinide compounds
- Superconducting Materials and Applications
- Magnetic Properties of Alloys
- High-pressure geophysics and materials
- Advanced Condensed Matter Physics
- Particle accelerators and beam dynamics
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Nuclear Materials and Properties
- Magnetic and transport properties of perovskites and related materials
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Electromagnetic Launch and Propulsion Technology
- Quantum, superfluid, helium dynamics
- Magnetic properties of thin films
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Theoretical and Computational Physics
- Magnetic Properties and Applications
- Mechanical and Optical Resonators
- Geomagnetism and Paleomagnetism Studies
- Quantum and electron transport phenomena
- Crystallography and Radiation Phenomena
- Carbon Nanotubes in Composites
Laboratoire National des Champs Magnétiques Intenses
2011-2022
Centre National de la Recherche Scientifique
2004-2022
Université Grenoble Alpes
2010-2022
Université Toulouse III - Paul Sabatier
2006-2018
Université de Toulouse
2008-2016
Université Joseph Fourier
2010-2014
Japan Atomic Energy Agency
2009
Institut National des Sciences Appliquées de Toulouse
2006-2008
University of Amsterdam
1988-2004
Vrije Universiteit Amsterdam
1996-2004
Near-infrared magneto-optical spectroscopy of single-walled carbon nanotubes reveals two absorption peaks with an equal strength at high magnetic fields ($>55\text{ }\text{ }\mathrm{T}$). We show that the peak separation is determined by Aharonov-Bohm phase due to tube-threading flux, which breaks time-reversal symmetry and lifts valley degeneracy. This field-induced breaking thus overcomes Coulomb-induced intervalley mixing predicted make lowest exciton state optically inactive (or dark).
The differential susceptibilities of the spin-fluctuation compounds ${\mathrm{TiBe}}_{2}$, ${\mathrm{UAl}}_{2}$, ${\mathrm{UCo}}_{2}$, and ${\mathrm{UPt}}_{3}$ have been measured at low temperatures as a function magnetic field up to 40 T. A systematic relation is observed between signs second derivatives susceptibility with respect temperature. characteristic ${H}_{\mathrm{sf}}$ temperature ${T}_{\mathrm{sf}}$ are defined by inflection points in \ensuremath{\chi}(H) \ensuremath{\chi}(T)...
The authors report self-consistent energy band calculations for UFe2 and UCo2 in four approximations: both semi-relativistic fully relativistic the paramagnetic ground states; spin-polarised with spin-orbit coupling included self consistently ferromagnetic state of UFe2. They compare ab initio calculated measured lattice constants, bulk moduli, linear specific heat coefficients, pressure dependence magnetic moment form factor. is found to be an enhanced paramagnet itinerant ferromagnet a due...
High-field (up to 35 T) magnetization measurements performed at 4.2 K along different crystal axes of hexagonal ${\mathrm{Ho}}_{2}$${\mathrm{Co}}_{17}$ reveal, above 20 T, magnetic transitions for field directions in the hexa- gonal plane that have not been studied before this type intermetallic compound. The data, analyzed a two-sublattice model, provide accurate results parameters system.
URu2Si2 is one of the most enigmatic strongly-correlated-electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite >30 years intense research, no consensus on order parameter its low-temperature hidden-order phase exists. A strong magnetic field transforms hidden into magnetically-ordered phases, whose has also been defying experimental observation. Here, thanks to an instrumentation breakthrough high-field neutron scattering, we identify...
The Laboratoire National des Champs Magnétiques Intenses (LNCMI) is a French host facility for experiments in high magnetic fields. Based on two sites, the LNCMI offers routinely static fields up to 36 T at its Grenoble site, and pulsed 90 using nondestructive magnets 180 single-turn Toulouse site. Internal research carried out lab experiment time allocated external researchers. founding member of European Magnetic Field Laboratory with Hochfeld-Magnetlabor Dresden (HLD) High Magnet...
X-ray powder diffraction experiments under pulsed magnetic fields were carried out at the DUBBLE beamline (BM26B) ESRF. A mobile generator delivered 110kJ to magnet coil, which was sufficient generate peak of 30T. liquid He flow cryostat allowed us vary sample temperature accurately between 8 and 300K. Powder patterns several samples recorded using 21keV monochromatic x-rays an on-line image plate detector. Here we present first results on suppression Jahn-Teller structural distortion in...
In this letter we describe our novel photon regeneration experiment for the axionlike particle search using a x-ray beam with energy of 50.2 keV and 90.7 keV, two superconducting magnets 3 T, Ge detector high quantum efficiency. A counting rate regenerated photons compatible zero has been measured. The corresponding limits on pseudoscalar particle-two coupling constant is obtained as function mass. Our setup widens window purely terrestrial experiments devoted to by photons. It also opens...
We present the first application of pulsed high magnetic fields up to 30 T for neutron diffraction experiments. As study, field variations a couple Bragg reflections have successfully been measured in frustrated antiferromagnet TbB4. The results show that conventional models fail, and model, which is mixture XY- Ising-type moments, matches half-magnetization state. deduce an interaction stabilizes orthogonal moment arrangement as origin unusual magnetization plateaus. Our demonstrate...
Using an elastic neutron scattering technique under a pulsed magnetic field up to 30 T, we determined the structure in half-magnetization plateau phase spinel CdCr2O4. The has cubic P4{3}32 symmetry, which is same as that observed HgCr2O4. This suggests despite their different zero-field ground states universal field-induced spin-lattice coupling mechanism at work Cr-based spinels.
We report neutron diffraction measurements on $\mathrm{U}({\mathrm{Ru}}_{0.96}{\mathrm{Rh}}_{0.04}{)}_{2}{\mathrm{Si}}_{2}$ single crystal under pulsed high magnetic fields up to 30 T applied along the tetragonal $c$ axis. The high-field experiments revealed that field-induced phase II above 26 corresponds a commensurate up-up-down ferrimagnetic structure characterized by wave vector $\mathbit{q}=(2/3,0,0)$ with moments parallel axis, which naturally explains one-third magnetization plateau...
We report on the stability of quantum Hall plateau in wide bars made from a chemically gated graphene film grown SiC. The $\ensuremath{\nu}=2$ quantized appears fields $B\ensuremath{\simeq}5\text{ }\text{ }\mathrm{T}$ and persists up to $B\ensuremath{\simeq}80\text{ }\mathrm{T}$. At high current density, breakdown regime, longitudinal resistance oscillates with $1/B$ periodicity an anomalous phase, which we relate presence additional electron reservoirs. field experimental data suggest that...
The power supply for a railgun used as long-range artillery is investigated in this paper. As described an earlier study, 8-kg projectile accelerated to 2500 m/s order bring it on steep ballistic trajectory. To further investigate the electrical behavior of proposed 25-MJ muzzle energy railgun, simulations with two different chains, each starting batteries, were performed. more conventional approach uses capacitive pulsed (CPPS), other option inductive (IPPS). An IPPS was designed detail and...
We have developed a pulsed magnet system with panoramic access for synchrotron x-ray diffraction in magnetic fields up to 31 T and at low temperature down 1.5 K. The apparatus consists of split-pair magnet, liquid nitrogen bath cool the coil, helium cryostat allowing sample temperatures from 250 Using 1.15 MJ mobile generator, field pulses 60 ms length were generated rise time 16.5 repetition rate 2 pulses/h T. setup was validated single crystal on ESRF beamline ID06.
Magnetization and magnetoresistivity measurements near 4.2 K on U${\mathrm{Al}}_{2}$ in fields up to 35 25 T, respectively, show a suppression of spin fluctuations this material between 15 20 T. The experiments strongly suggest that the field temperature effects paramagnon contributions are closely related. validity various theoretical models also discussed light these measurements.
We report the first direct observation of influence high magnetic fields on Jahn-Teller (JT) transition in TbVO(4). Contrary to spectroscopic and methods, x-ray diffraction directly measures JT distortion; splitting between (311)/(131) (202)/(022) pairs Bragg reflections is proportional order parameter. Our experimental results are compared mean-field calculations, taking into account all possible orientations grains relative applied field, qualitative agreement obtained.