284 citations · 2.6k across the 65 of their papers we have counts for
23 papers · 1 filter
Disentangling lattice and electronic instabilities in the excitonic insulator candidate TaNiSe by nonequilibrium spectroscopy
Kota Katsumi, Alexandr Alekhin, Sofia-Michaela Souliou +7
TaNiSe is an excitonic insulator candidate showing the semiconductor/semimetal-to-insulator (SI) transition below = 326 K. However, since a structural transi…
Elastic and magnetoelastic properties of TbMnO3 single crystal by nanosecond time resolved acoustics and first-principles calculations
Pierre Hemme, Philippe Djemia, Pauline Rovillain +8
Time resolved pump and probe acoustics and first-principles calculations were employed to assess elastic properties of the TbMnO3 perovskite manganite having orthorhombic symmetry.…
Orbital dichotomy of Fermi liquid properties in SrRuO revealed by Raman spectroscopy
J. -C. Philippe, B. Baptiste, C. Sow +6
We report a polarization-resolved Raman spectroscopy study of the orbital dependence of the quasiparticles properties in the prototypical multi-band Fermi liquid Sr\textsubscript{2…
Elastic properties assessment in the multiferroic BiFeO3 by pump and probe method
Pierre Hemme, Philippe Djemia, Pauline Rovillain +8
We have performed elasticity measurements in the bulk multiferroic BiFeO3 (BFO) using acoustical pump and probe spectroscopy. The sound velocities of the (quasi)-longitudinal and o…
Amplitude mode of charge density wave in TTF[Ni(dmit)2]2 observed by electronic Raman scattering
M. Revelli Beaumont, Y. Gallais, A. Sacuto +5
We measured the optical signature of the charge density waves (CDWs) in the multiband conductor TTF[Ni(dmit)2]2 by electronic Raman scattering. At low energies, a hump develops bel…
Possible observation of the signature of the bad metal phase and its crossover to a Fermi liquid in K(BEDT-TTF)2Cu(NCS)2 bulk and nanoparticles by Raman scattering
M. Revelli Beaumont, P. Hemme, Y. Gallais +6
K(BEDT-TTF)2Cu(NCS)2 has been investigated by Raman scattering in both bulk and nanoparticle compounds. Phonon modes from 20 to 1600 cm-1 have been assigned. Focusing on the unexpl…
Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles
Ian Aupiais, Pierre Hemme, Marc Allen +8
We have performed Raman scattering measurements on BiFeO3 nanoparticles and studied both magnetic and lattice modes. We reveal strong anomalies between 140 K and 200 K in the frequ…
Colossal electromagnon excitation in the non-cycloidal phase of TbMnO3 under pressure
Ian Aupiais, Masahito Mochizuki, Hideaki Sakata +4
The magnetoelectric coupling, i.e., cross-correlation between electric and magnetic orders, is a very desirable property to combine functionalities of materials for next-generation…
The role of the rare earth in the lattice and magnetic coupling in multiferroic h-HoMnO3
J. Liu, Y. Gallais, M-A. Measson +3
We used Raman scattering to study the lattice and magnetic excitations in the hexagonal HoMnO3 single crystals. The E2 phonon mode at 237 cm-1 is affected by the magnetic order. Th…
Magnetic transitions in CaMn7O12 : a Raman observation of spin-phonon couplings
C. Toulouse, C. Martin, M-A. Measson +3
The quadruple Calcium manganite (CaMn7O12) is a multiferroic material that exhibits a giant magnetically-induced ferroelectric polarization which makes it very interesting for magn…
Anisotropic Kondo pseudo-gap in URu2Si2
J. Buhot, X. Montiel, Y. Gallais +8
A polarized electronic Raman scattering study reveals the emergence of symmetry dependence in the electronic Raman response of single crystalline URuSi below the Kondo…
Raman Active High Energy Excitations in URuSi
Jonathan Buhot, Yann Gallais, Maximilien Cazayous +5
We have performed Raman scattering measurements on URuSi single crystals on a large energy range up to 1300 cm and in all the Raman active symmetries as a fun…
Driving spin excitations by hydrostatic pressure in BiFeO3
J. Buhot, C. Toulouse, Y. Gallais +10
Optical spectroscopy has been combined with computational and theoretical techniques to show how the spin dynamics in the model multiferroic BiFeO3 responds to the application of h…
Symmetry of the Excitations in the Hidden Order State of URu2Si2
J. Buhot, M. -A. Méasson, Y. Gallais +4
We have performed polarized electronic Raman scattering on URu2Si2 single crystals at low temperature down to 8 K in the hidden order state and under magnetic field up to 10 T. The…
Lattice and spin excitations in multiferroic h-YMnO3
C. Toulouse, L. Chaix, J. Liu +11
We used Raman and terahertz spectroscopies to investigate lattice and magnetic excitations and their cross-coupling in the hexagonal YMnO3 multiferroic. Two phonon modes are strong…
Lattice and spin excitations in multiferroic h-YbMnO3
J. Liu, C. Toulouse, P. Rovillain +6
Lattice and spin excitations have been studied by Raman scattering in hexagonal YbMnO3 single crystals. The temperature dependences of the phonon modes show that the E2 mode at 256…
Electromagnon and phonon excitations in multiferroic TbMnO3
P. Rovillain, J. Liu, M. Cazayous +4
We have performed Raman measurements on TbMnO3 single crystal under magnetic field along the three crystallographic directions. The flip of the spin spiral plane creates an electro…
Exploring the Dark Side of Cuprate Superconductors: s-wave Symmetry of the Pseudogap
S. Sakai, S. Blanc, M. Civelli +12
We reveal the full energy-momentum structure of the pseudogap of underdoped high-Tc cuprate superconductors. Our combined theoretical and experimental analysis explains the spectra…
Magneto-electric excitations in multiferroic TbMnO3 by Raman scattering
P. Rovillain, M. Cazayous, Y. Gallais +3
Low energy excitations in the multiferroic material TbMnO3 have been investigated by Raman spectroscopy. Our observations reveal the existence of two peaks at 30 cm-1 and 60 cm-1.…
Doping dependence of the lattice dynamics in Ba(FeCo)As studied by Raman spectroscopy
L. Chauviere, Y. Gallais, M. Cazayous +4
We report Raman scattering spectra of iron-pnictide superconductor Ba(FeCo)As single crystals with varying cobalt content. Upon cooling through the tetragon…
Interplay between magnetic and lattice excitations in BiFeO
M. Cazayous, A. Sacuto, D. Lebeugle +1
We have performed Raman scattering investigations on the high energy magnetic excitations in a BiFeO single crystal as a function of both temperature and laser excitation energ…
Observation of electromagnon excitations in the BiFe0 spiral magnet
M. Cazayous, Y. Gallais, A. Sacuto +3
Recently, oxide multiferroics have attracted much attention due to their large magnetoelectric effect which allows the tuning of magnetic properties with electric field and vice ve…
Electric field effect on BiFeO single crystal investigated by Raman spectroscopy
M. Cazayous, D. Malka, D. Lebeugle +1
Micro-Raman spectroscopy has been used to study lattice dynamics associated with the ferroelectric domains of a BiFeO single crystal at low temperature. The phonon assignment s…