Publications (102)
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…
Very large spontaneous electric polarization in BiFeO3 single crystals at room temperature and its evolution under cycling fields
D. Lebeugle, D. Colson, A. Forget +1
Electric polarization loops are measured at room temperature on highly pure BiFeO3 single crystals synthesized by a flux growth method. Because the crystals have a high electrical…
Light controlled magnetoresistance and magnetic field controlled photoresistance in CoFe film deposited on BiFeO3
B. Kundys, C. Meny, M. R. J. Gibbs +5
We present a magnetoresistive-photoresistive device based on the interaction of a piezomagnetic CoFe thin film with a photostrictive BiFeO3 substrate that undergoes light-induced s…
Coupling between quasiparticles and a bosonic mode in the normal state of HgBaCuO
Y. Gallais, M. Le Tacon, A. Sacuto +1
We report a doping dependent study of the quasiparticles dynamics in HgBaCuO via Electronic Raman Scattering. A well-defined energy scale is found in the normal state…
Universal relationship between the energy scales of the pseudogap phase, the superconducting state and the charge density wave order in copper oxide superconductors
B. Loret, N. Auvray, G. D. Gu +7
We report the hole doping dependencies of the pseudogap phase energy scale, , the anti-nodal (nodal) superconducting energy scales ($2Î^{N}_{\rm…
Thermopower in the strongly overdoped region of single-layer Bi2Sr2CuO6+d superconductor
Z. Konstantinovic, G. Le Bras, A. Forget +5
The evolution of the thermoelectric power S(T) with doping, p, of single-layer Bi2Sr2CuO6+d ceramics in the strongly overdoped region is studied in detail. Analysis in term of drag…
Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films
H. Bea, M. Bibes, A. Barthelemy +10
We have explored the influence of deposition pressure and temperature on the growth of BiFeO3 thin films by pulsed laser deposition onto (001)-oriented SrTiO3 substrates. Single-ph…
Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering
S. Benhabib, Y. Gallais, M. Cazayous +7
We explored by electronic Raman scattering the superconducting state of Bi-2212 single crystal by performing a fine tuned doping study. We found three distinct energy scales in A1g…
Electric-field-induced spin-flop in BiFeO3 single crystals at room-temperature
D. Lebeugle, D. Colson, A. Forget +3
Bismuth ferrite, BiFeO3, is the only known room-temperature 'multiferroic' material. We demonstrate here, using neutron scattering measurements in high quality single crystals, tha…
Evolution of the gaps through the cuprate phase-diagram
W. Guyard, M. Le Tacon, M. Cazayous +4
The actual physical origin of the gap at the antinodes, and a clear identification of the superconducting gap are fundamental open issues in the physics of high- superconducto…
Opening of the superconducting gap in the hole pockets of Ba(Fe(1-x)Co(x))2As2 as seen via Angle-Resolved PhotoElectron Spectroscopy
B. Mansart, E. Papalazarou, M. Fuglsang Jensen +8
We present an Angle-Resolved PhotoElectron Spectroscopy study of the changes in the electronic structure of electron doped Ba(Fe(1-x)Co(x))2As2 across the superconducting phase tra…
Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(FeCo)As
L. Chauvière, Y. Gallais, M. Cazayous +4
We report a doping dependent electronic Raman scattering measurements on iron-pnictide superconductor Ba(FeCo)As single crystals. A strongly anisotropic gap is…
Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(FeCo)As
Y. -X. Yang, Y. Gallais, F. Rullier-Albenque +6
We report electronic Raman scattering measurements of Sr(FeCo)As single crystals in their magnetic - Spin Density Wave (SDW) phase. The spectra display multiple…
New insights into the phase diagram of the copper oxide superconductors from electronic Raman scattering
A. Sacuto, Y. Gallais, M. Cazayous +3
Mechanism of unconventional superconductivity is still unknown even if more than 25 years have been passed since the discovery of high-Tc cuprate superconductors by J.G. Bednorz an…
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…
Anomalous Electronic Susceptibility in Bi2sr2cuo6+d
G. Le Bras-Jasmin, Z. Konstantinovic, J. P. Carton +6
We report magnetic susceptibility performed on overdoped Bi2Sr2CuO6+d powders as a function of oxygen doping d and temperature T. The decrease of the spin susceptibility chis with…
Investigations on the relationship between and the superconducting gap under magnetic and non-magnetic impurity substitutions in YBaCuO
M. Le Tacon, A. Sacuto, Y. Gallais +2
We report electronic Raman scattering measurements on optimally doped YBa2Cu3O7 where Zn or Ni impurities have been substituted by Cu. Using Raman selection rules, we have probed t…
Orbitally resolved lifetimes in Ba(Fe0.92Co0.08)2As2 measured by ARPES
V. Brouet, M. Fuglsang Jensen, A. Nicolaou +5
Despite many ARPES investigations of iron pnictides, the structure of the electron pockets is still poorly understood. By combining ARPES measurements in different experimental con…
Long range order in the dipolar XY antiferromagnet ErSnO
S. Petit, E. Lhotel, F. Damay +3
ErSnO remains a puzzling case among the extensively studied frustrated compounds of the rare-earth pyrochlore family. Indeed, while a first order transition towards a l…
Ultrafast transient response and electron-phonon coupling in the iron-pnictide superconductor Ba(Fe(1-x)Co(x))2As2
B. Mansart, D. Boschetto, A. Savoia +7
The transient response of Ba(Fe(1-x)Co(x))2As2, x=0.08 was studied by pump-probe optical reflectivity. After ultrafast photoexcitation, hot electrons were found to relax with two d…
Electrochemical Oxygen Intercalation into SrIrO
L. Fruchter, V. Brouet, D. Colson +3
Oxygen was electrochemically intercalated into SrIrO sintered samples, single crystals and a thin film. We estimate the diffusion length to a few m and the concentratio…
Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
F. Rullier-Albenque, D. Colson, A. Forget +2
We report a systematic study of structural and transport properties in single crystals of Ba(Fe_(1-x)Ru_x)_2As_2 for x ranging from 0 to 0.5. The isovalent substitution of Fe by Ru…
Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals
P. Rovillain, M. Cazayous, Y. Gallais +4
Raman scattering measurements on BiFeO3 single crystals show an important coupling between the magnetic order and lattice vibrations. The temperature evolution of phonons shows tha…
Evidence for two distinct energy scales in the Raman spectra of YBa2(CuNi)O6.95
Y. Gallais, A. Sacuto, P. Bourges +3
We report low energy electronic Raman scattering from Ni-substituted YBa2Cu3O6.95 single crystals with Tc ranging from 92.5 K to 78 K. The fully symmetrical A1g channel and the B1g…
Scattering Rate Gap in the IR Response of HgBa_2Ca_2Cu_3O_{8+delta}
J. J. McGuire, M. Windt, T. Startseva +3
The ab-plane optical spectra of one underdoped and one nearly optimally doped single crystal of HgBa_2Ca_2Cu_3O_{8+delta} were investigated in the frequency range from 40 to 40,000…
Nodes of the superconducting gap probed by electronic Raman scattering in HgBa_{2}CaCu_{2}O_{6+δ} single crystals
A. Sacuto, R. Combescot, N. Bontemps +3
Pure electronic Raman spectra with no phonon structures superimposed to the electronic continuum, are reported, in optimally doped HgBa_{2}CaCu_{2}O_{6+δ} single crystals (T_{c }=…
Incommensurate spin density wave in Co-doped BaFe2As2
P. Bonville, F. Rullier-Albenque, D. Colson +1
57Fe Mossbauer spectroscopy measurements are presented in the underdoped Ba(Fe{1-x}Cox)2As2 series for x=0.014 (T_c < 1.4K) and x=0.03 and 0.045 (T_c ~ 2 and 12K respectively). The…
Nernst effect and disorder in the normal state of high-T_{c} cuprates
F. Rullier-Albenque, R. Tourbot, H. Alloul +3
We have studied the influence of disorder induced by electron irradiation on the Nernst effect in optimally and underdoped YBa2Cu3O(7-d) single crystals. The fluctuation regime abo…
Anomalous electronic susceptibility in Bi2Sr2CuO6+d and comparison with other overdoped cuprates
G. Le Bras, Z. Konstantinovic, J-P. Carton +6
We report magnetic susceptibility performed on overdoped Bi2Sr2CuO6+d powders as a function of oxygen doping d and temperature T. The decrease of the spin susceptibility with incre…
Intimate link between Charge Density Wave, Pseudogap and Superconducting Energy Scales in Cuprates
B. Loret, Y. Gallais, M. Cazayous +6
The cuprate high temperature superconductors develop spontaneous charge density wave (CDW) order below a temperature and over a wide range of hole doping (p). An outstand…
Series of Bulk Magnetic Phase Transitions in NaxCoO2: a muSR study
P. Mendels, D. Bono, J. Bobroff +8
Using muon spin rotation, well-defined bulk ~ 100% magnetic phases in NaxCoO2 are revealed. A novel magnetic phase is detected for x = 0.85 with the highest transition temperature…
Magnetic critical properties and basal-plane anisotropy of SrIrO
L. Fruchter, D. Colson, V. Brouet
The anisotropic magnetic properties of SrIrO are investigated, using longitudinal and torque magnetometry. The critical scaling across of the longitudinal magnetizati…
Significant reduction of electronic correlations upon isovalent Ru substitution of BaFe2As2
V. Brouet, F. Rullier-Albenque, M. Marsi +10
We present a detailed investigation of Ba(Fe0.65Ru0.35)2As2 by transport measurements and Angle Resolved photoemission spectroscopy. We observe that Fe and Ru orbitals hybridize to…
High Field determination of superconducting fluctuations in high-Tc cuprates
F. Rullier-Albenque, H. Alloul, D. Colson +1
Large pulsed magnetic fields up to 60 Tesla are used to suppress the contribution of superconducting fluctuations (SCF) to the ab-plane conductivity above Tc in a series of YBa2Cu3…
Self-assembled line network in BiFeO3 thin films
B. Colson, V. Fuentes, Z. Konstantinovic +9
In this work we report on the controlled fabrication of a self-assembled line network in highly epitaxial BiFeO3 thin films on top of LaAlO3 in the kinetically limited grown region…
Failure of the empirical OCT law in the Bi2Sr2CuO6+d compound
Z. Konstantinovic, G. Le Bras, A. Forget +6
We have studied the evolution of the thermoelectric power S(T) with oxygen doping of single-layered Bi2Sr2CuO6+d thin films and ceramics in the overall superconducting (Tc, S290K)…
Superconducting Fluctuations, Pseudogap and Phase Diagram in Cuprates
H. Alloul, F. Rullier-Albenque, B. Vignolle +2
We report transport measurements using pulsed magnetic fields to suppress the superconducting fluctuations (SCF) conductivity in a series of YBa_2Cu_3O_(6+x) samples. These experim…
Symmetry of the superconducting gap in single crystals from electronic Raman scattering
A. Sacuto, N. Bontemps, P. Monod +3
Pure electronic Raman spectra with no phonon structures superimposed to the electronic continuum, are reported for the first time, in optimally doped si…
Impact of the 2 Fe unit cell on the electronic structure measured by ARPES in iron pnictides
V. Brouet, M. Fuglsang Jensen, Ping-Hui Lin +7
In all iron pnictides, the positions of the ligand alternatively above and below the Fe plane create 2 inequivalent Fe sites. This results in 10 Fe 3d bands in the electronic struc…
Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4
J. Yang, J. Hwang, E. Schachinger +5
The electron-boson spectral density function I^2ChiOmega responsible for carrier scattering of the high temperature superconductor HgBa2CuO4 (Tc = 90 K) is calculated from new data…
Coherent and incoherent bands in La and Rh doped Sr3Ir2O7
V. Brouet, L. Serrier-Garcia, A. Louat +6
In Sr2IrO4 and Sr3Ir2O7, correlations, magnetism and spin-orbit coupling compete on similar energy scales, creating a new context to study metal-insulator transitions (MIT). We use…
Exploration of the Hg-based cuprate superconductors by Raman spectroscopy under hydrostatic pressure
N. Auvray, B. Loret, S. Chibani +8
The superconducting phase of the (Hg-1201) and (Hg-1223) cuprates has been investi…
Observing the Superconducting State of HgBa2Ca2Cu3O8+d Cuprate by Electronic Raman Scattering
B. Loret, A. Sacuto, D. Colson +4
Electronic Raman scattering with in and out of (ab) plane polarizations have been performed on HgBa2Ca2Cu3O8+d in a slightly underdoped single crystal with a critical temperature T…
Raman scattering as a probe of charge nematic fluctuations in iron based superconductors
Y. -X. Yang, Y. Gallais, R. M Fernandes +7
We report Raman scattering measurement of charge nematic fluctuations in the tetragonal phase of BaFeAs and Sr(FeCo)As (x=0.04) single crystals. In both…
Strong pinning and vortex energy distributions in single crystalline Ba(Fe1-xCox)2As2
S. Demirdis, C. J. van der Beek, Y. Fasano +4
The interrelation between heterogeneity and flux pinning is studied in Ba(Fe1-xCox)2As2 single crystals with widely varying Co-content x. Magnetic Bitter decoration of the supercon…
Nematic Fluctuations in the Cuprate Superconductor BiSrCaCuO
N. Auvray, S. Benhabib, M. Cazayous +8
Establishing the presence and the nature of a quantum critical point in their phase diagram is a central enigma of the high-temperature superconducting cuprates. It could explain t…
Resonant Raman scattering in mercurate single crystals
Y. Gallais, A. Sacuto, D. Colson
We report resonant electronic Raman scattering in optimally doped single layer HgBaCuO (Hg-1201) and trilayer HgBaCaCuO (Hg-1223) single crystals.…
New insight on the phase diagram of the superconducting iron spin ladder BaFeS
Y. Oubaid, V. Balédent, O. Fabelo +9
BaFeS and BaFeSe are the only two quasi-one-dimensional iron-based compounds that become superconductors under pressure. Interestingly, these two compounds exhibit…
Spin singlet and quasiparticles excitations in cuprate superconductors
M. Mezidi, A. Alekhin, G. D. Gu +5
We followed step by step the transition from an antiferromagnetic (AF) Mott insulator to a superconducting (SC) metal in the BiSrCaCuO (Bi-2212) cuprate usin…
Observation of incipient charge nematicity in Ba(FeCo)As
Y. Gallais, R. M. Fernandes, I. Paul +7
Using electronic Raman spectroscopy, we report direct measurements of charge nematic fluctuations in the tetragonal phase of strain-free Ba(FeCoAs single c…
Magnetic order and spin fluctuations in the spin liquid TbSnO
I. Mirebeau, A. Apeteri, J. Rodriguez-Carvajal +7
We have studied the spin liquid TbSnO by neutron diffraction and specific heat measurements. Below about 2 K, the magnetic correlations change from antiferromagnetic…
Electronic Raman scattering on under-doped Hg-1223 high-Tc superconductors:investigations on the symmetry of the order parameter
A. Sacuto, J. Cayssol, D. Colson +1
In order to obtain high quality, reliable electronic Raman spectra of a high-Tc superconductor compound, we have studied strongly under-doped HgBa2Ca2Cu3O8+d. This choice was made…
Electronic Raman scattering in HgBa_{2}Ca_{2}Cu_{3}O_{8+δ} single crystals. Analysis of the superconducting state
A. Sacuto, R. Combescot, N. Bontemps +3
Electronic Raman scattering measurements have been performed on single crystals in the superconducting state. Pure electronic Raman spectra with no…
SrIrO magnetic phase diagram, from resistivity
L. Fruchter, G. Collin, D. Colson +1
We show that, contrary to previous belief, the transition to the antiferromagnetic state of SrIrO in zero magnetic field does show up in the transverse resistivity. We attr…
Electric-field control of spin waves at room temperature in multiferroic BiFeO3
P. Rovillain, R. de Sousa, Y. Gallais +7
To face the challenges lying beyond current CMOS-based technology, new paradigms for information processing are required. Magnonics proposes to use spin waves to carry and process…
Collapse of the Normal State Pseudogap at a Lifshitz Transition in BiSrCaCuO Cuprate Superconductor
S. Benhabib, A. Sacuto, M. Civelli +9
We report a fine tuned doping study of strongly overdoped BiSrCaCuO single crystals using electronic Raman scattering. Combined with theoretical calculations,…
ESR study of the single-ion anisotropy in the pyrochlore antiferromagnet Gd2Sn2O7
V. N. Glazkov, A. I. Smirnov, J. P. Sanchez +3
Single-ion anisotropy is of importance for the magnetic ordering of the frustrated pyrochlore antiferromagnets Gd2Ti2O7 and Gd2Sn2O7. The anisotropy parameters for the Gd2Sn2O7 wer…
Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe1-xNix)2As2: a 57Fe Mossbauer spectroscopy study
A. Olariu, P. Bonville, F. Rullier-Albenque +2
We report 57Fe Mossbauer spectral results in pure and doped Ba(Fe1-xNix)2As2 with x=0.01 and 0.03. We show that all these materials present a first-order magnetic transition toward…
Ground State of BaFe2S3 from Lattice and Spin Dynamics
Y. Oubaid, S. Deng, NS. Dhami +7
We investigate the interplay between lattice symmetry, phonons, and magnetism in the quasi-one-dimensional ladder compound BaFeS by combining polarized synchrotron infrared…
Hall effect and resistivity study of the magnetic transition, carrier content and Fermi liquid behavior in Ba(Fe(1-x) Cox)2As2
F. Rullier-Albenque, D. Colson, A. Forget +1
The negative Hall constant R_H measured all over the phase diagram of Ba(Fe(1-x)Cox)2As2 allows us to show that electron carriers always dominate the transport properties. The evol…
Unconventional high-energy-state contribution to the Cooper pairing in under-doped copper-oxide superconductor HgBaCaCuO
B. Loret, S. Sakai, Y. Gallais +6
We study the temperature-dependent electronic B1g Raman response of a slightly under-doped single crystal HgBaCaCuO with a superconducting critical temperature…
Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(FeCo)As
J. -C. Philippe, A. Lespinas, J. Faria +7
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-re…
Longitudinal magnetoresistance in Co-doped BaFe2As2 and LiFeAs single crystals: Interplay between spin fluctuations and charge transport in iron-pnictides
F. Rullier-Albenque, D. Colson, A. Forget
The longitudinal in-plane magnetoresistance (LMR) has been measured in different Ba(Fe_(1-x)Co_x)2As2 single crystals and in LiFeAs. For all these compounds, we find a negative LMR…
Space Group Symmetry of BaFeSe: ab initio-Experiment Phonon Study
M. J. Weseloh, V. Balédent, W. Zheng +7
This paper presents a study of the structure dynamics in BaFeSe. We combined first-principle calculations, infrared measurements and a thorough symmetry analysis. Our study…
Infrared phonon dynamics of multiferroic BiFeO3 single crystal
R. P. S. M. Lobo, R. L. Moreira, D. Lebeugle +1
We discuss the first infrared reflectivity measurement on a BiFeO3 single crystal between 5 K and room temperature. The 9 predicted ab-plane E phonon modes are fully and unambiguou…
Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates
M. Le Tacon, A. Sacuto, A. Georges +4
The superconducting state of underdoped cuprates is often described in terms of a single energy-scale, associated with the maximum of the (d-wave) gap. Here, we report on electroni…
Large temperature dependence of the number of carriers in Co-doped BaFe2As2
V. Brouet, Ping-Hui Lin, Y. Texier +10
Using angle-resolved photoemission spectroscopy, we study the evolution of the number of carriers in Ba(Fe(1-x)Cox)2As2 as a function of Co content and temperature. We show that th…
The nodal gap component as a good candidate for the superconducting order parameter in cuprates
W. Guyard, A. Sacuto, M. Cazayous +4
Although more than twenty years have passed since the discovery of high temperature cuprate superconductivity, the identification of the superconducting order parameter is still un…
BaFe2Se3 a quasi-unidimensional non-centrosymmetric superconductor
S. Deng, A. Roll, W. G. Zheng +10
The spin-ladder compounds of the BaFe2X3 (X = chalcogen) family may be viewed as dimensional reductions (along stripe-like motifs) of the two-dimensional iron-based pnictide planes…
The modulated antiferromagnetic structures in multiferroic FeVO4: a 57Fe Mössbauer spectroscopy investigation
D. Colson, A. Forget, P. Bonville
We present a 57Fe Mössbauer spectroscopy study of the two incommensurate magnetic phases in the multiferroic material FeVO4. We devise lineshapes appropriate for planar elliptical…
Interplay between the pseudogap and superconductivity in HgBaCuO single crystals
Y. Gallais, A. Sacuto, T. P. Devereaux +1
We report a doping dependant Electronic Raman Scattering (ERS) study of HgBaCuO (Hg-1201) single crystals. We investigate the dynamics of the antinodal and nodal quasi…
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…
Determination and Control of Oxygen Stoichiometry in the Cuprate Bi2sr2cuo6+D
F. Jean, D. Colson, G. Collin +2
The relatively low Tc of Bi2Sr2CuO6+D allows to study normal-state down to low temperatures and the non-substituted compound is intrinsically strongly overdoped. Hole concentration…
Photostriction in BiFeO3: wavelength dependence
B. Kundys, M. Viret, C. Meny +3
In electrically polar solids optomechanical effects result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas the former…
Vertical temperature-boundary of the pseudogap under the superconducting dome of the Bi2Sr2CaCu2O8+d phase-diagram
B. Loret, S. Sakai, S. Benhabib +11
Combining electronic Raman scattering experiments with cellular dynamical mean field theory, we present evidence of the pseudogap in the superconducting state of various hole-doped…
Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFeAs
J. -C. Philippe, J. Faria, A. Forget +5
We report a Raman scattering study of nematic degrees of freedom in the iron-based superconductor parent compound BaFeAs under tunable uniaxial strain. We demonstrate that…
Multiorbital effects on the transport and the superconducting fluctuations in LiFeAs
F. Rullier-Albenque, D. Colson, A. Forget +1
The resistivity, Hall effect and transverse magnetoresistance (MR) have been measured in low residual resistivity single crystals of LiFeAs. A comparison with angle resolved photoe…
Effects of Magnetic and non-Magnetic Impurities on the Superconducting State of YBaCuO
M. Le Tacon, A. Sacuto, Y. Gallais +3
We report Electronic Raman Scattering measurements on optimally doped Zn and Ni substituted YBCO in A and B channels. We show that the superconducting gap energy is i…
Thermopower in Overdoped Region of Cuprates
Z. Konstantinovic, G. Le Bras-Jasmin, D. Colson +4
The thermoelectric power S(T) of single-layer Bi2Sr2CuO6+d is studied as a function of oxygen doping in the strongly overdoped region of the phase diagram (T, d). As other physical…
Different effects of Ni and Co substitution on the transport properties of BaFe2As2
A. Olariu, F. Rullier-Albenque, D. Colson +1
We report resistivity and Hall effect results on Ba(Fe1-xNix)2As2 and compare them with those in Ba(Fe1-xCox)2As2. The Hall number RH is negative for all x values from 0.01 to 0.14…
Magnetization and magneto-electric effect in La-doped BiFeO3
G. Le Bras-Jasmin, D. Colson, A. Forget +3
We report on magnetisation and magneto-capacitance measurements in the Bi1-xLaxFeO3 series for 0 < x < 0.15. We confirm that doping with La reduces the threshold magnetic field Hc…
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…
Raman scattering study of Spin-Density-Wave order and electron-phonon coupling in Ba(FeCo)As
L. Chauvière, Y. Gallais, M. Cazayous +4
We report Raman scattering measurements on iron-pnictide superconductor Ba(FeCo)As single crystals with varying cobalt content. The electronic Raman continu…
NMR study of electronic correlations in Mn-doped Ba(Fe1-xCox)2As2 and BaFe(As1-xPx)2
D. LeBoeuf, Y. Texier, M. Boselli +3
We probe the real space electronic response to a local magnetic impurity in isovalent and heterovalent doped BaFe2As2 (122) using Nuclear Magnetic Resonance (NMR). The local moment…
Two Distinct Electronic Contributions in the Fully Symmetric Raman Response of High Cuprates
M. Le Tacon, A. Sacuto, D. Colson
We show by non resonant effect in HgBaCuO (Hg-1201)and by Zn substitutions in YBaCuO (Y-123) compounds that the fully symmetric Raman spectrum has two…
Angle-resolved photoemission study of the role of nesting and orbital orderings in the antiferromagnetic phase of BaFe2As2
M. Fuglsang Jensen, V. Brouet, E. Papalazarou +6
We present a detailed comparison of the electronic structure of BaFe2As2 in its paramagnetic and antiferromagnetic (AFM) phases, through angle-resolved photoemission studies. Using…
Universal -linear resistivity and Planckian limit in overdoped cuprates
A. Legros, S. Benhabib, W. Tabis +13
The perfectly linear temperature dependence of the electrical resistivity observed as 0 in a variety of metals close to a quantum critical point is a major puzzle o…
Charge order near the antiferromagnetic quantum critical point in the trilayer high cuprate HgBaCaCuO
V. Oliviero, I. Gilmutdinov, D. Vignolles +6
We study the transport properties of underdoped trilayer cuprate HgBaCaCuO with doping level = 0.1 - 0.12 in magnetic field up to 88 T. We report for the…
Atomic coexistence of superconductivity and incommensurate magnetic order in the Ba(Fe1-xCox)2As2 pnictide
Y. Laplace, J. Bobroff, F. Rullier-Albenque +2
75As NMR and susceptiblity were measured in a Ba(Fe1-xCox)2As2 single crystal for x=6%. Nuclear Magnetic Resonance (NMR) spectra and relaxation rates allow to show that all Fe site…
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…
Evidence for antiferromagnetism coexisting with charge order in the trilayer cuprate HgBaCaCuO
V. Oliviero, S. Benhabib, I. Gilmutdinov +9
Multilayered cuprates possess not only the highest superconducting temperature transition but also offer a unique platform to study disorder-free CuO planes and the interplay b…
Electronic Raman Scattering in copper oxide Superconductors: Understanding the Phase Diagram
A. Sacuto, Y. Gallais, M. Cazayous +5
Electronic Raman scattering measurements have been performed on hole doped copper oxide superconductors as a function of temperature and doping level. In the superconducting state…
Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors
B. Xu, Y. M. Dai, H. Xiao +8
In iron-based superconductors, a spin-density-wave (SDW) magnetic order is suppressed with doping and unconventional superconductivity appears in close proximity to the SDW instabi…
Anomalous phonon redshift in K-doped BaFe2As2 iron pnictides
B. Xu, Y. M. Dai, B. Shen +9
The effect of K, Co and P dopings on the lattice dynamics in the BaFeAs system is studied by infrared spectroscopy. We focus on the phonon at 253 cm, the high…
Light-induced size changes in BiFeO3 crystals
B. Kundys, M. Viret, D. Colson +1
Multifunctional oxides are promising materials because of their fundamental physical properties as well as their potential in applications1. Among these materials, multiferroics ex…
Total suppression of superconductivity by high magnetic fields in YBa2 Cu3O6.6
F. Rullier-Albenque, H. Alloul, Cyril Proust +3
We have studied in fields up to 60T the variation of the transverse magnetoresistance (MR) of underdoped YBCO6.6 crystals either pure or with Tc reduced down to 3.5K by electron ir…
Absence of large nanoscale electronic inhomogeneities in the Ba(Fe1-xCox)2As2 pnictide
Y. Laplace, J. Bobroff, F. Rullier-Albenque +2
75As NMR and susceptiblity were measured in a Ba(Fe1-xCox)2As2 single crystal for x=6% for various field H values and orientations. The sharpness of the superconducting and magneti…
Optical Writing of Magnetic Properties by Remanent Photostriction
V. Iurchuk, D. Schick, J. Bran +13
We present an optically induced remanent photostriction in BiFeO3, resulting from the photovoltaic effect, which is used to modify the ferromagnetism of Ni film in a hybrid BiFeO3/…
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…
Nesting between hole and electron pockets in Ba(Fe1-xCox)2As2 (x=0-0.3) observed with angle-resolved photoemission
V. Brouet, M. Marsi, B. Mansart +7
We present a comprehensive angle-resolved photoemission study of the three-dimensional electronic structure of Ba(Fe1-xCox)2As2. The wide range of dopings covered by this study, x=…