Publications (22)
Role of the ferromagnetic component in the ferroelectricity of YMnO3
Kiran Singh, Natalia Bellido, Charles Simon +4
We performed magnetic and ferroelectric measurements, first principle calculations and Landau theory analysis on hexagonal YMnO3. The polarization and the AFM order parameter were…
Magnetoelectric coupling in polycrystalline FeVO4
Bohdan Kundys, Christine Martin, Charles Simon
We report coupling between magnetic and electric orders for antiferromagnetic polycrystalline FeVO4 in which magnetism-induced polarization has been recently found in noncollinear…
Understanding interface effects in perovskite thin films
Marie-Bernadette Lepetit, Bernard Mercey, Charles Simon
The control of matter properties (transport, magnetic, dielectric,...) using synthesis as thin films is strongly hindered by the lack of reliable theories, able to guide the design…
Magnetic field dependence of the magnetic phase separation in Pr1-xCaxMnO3 manganites studied by small-angle neutron scattering
Damien Saurel, Annie Brulet, Andre Heinemann +3
Transport properties of manganese oxides suggest that their colossal magnetoresistance (CMR) is due to percolation between ferromagnetic metallic (FM) clusters in an antiferromagne…
Dual electronic states in thermoelectric cobalt oxide
Patrice Limelette, Sylvie Hebert, Herve Muguerra +2
We investigate the low temperature magnetic field dependence of the resistivity in the thermoelectric misfit cobalt oxide [Bi1.7Ca2O4]0.59CoO2 from 60 K down to 3 K. The scaling of…
Nuclear and magnetic structure of an epitaxial LaSrMnO film using diffraction methods
Himanshu Himanshu, Elisa Rebolini, Ketty Beauvois +6
We use a combination of transmission electron microscopy, X-Ray and neutron diffraction, SQUID magnetometry and symmetry analysis to determine the nuclear and magnetic structure of…
Effect of magnetic field and temperature on the ferroelectric loop in MnWO4
Bohdan Kundys, Charles Simon, Christine Martin
The ferroelectric properties of MnWO4 single crystal have been investigated. Despite a relatively low remanent polarization, we show that the sample is ferroelectric. The shape of…
Field dependence of the electronic phase separation in Pr0.67Ca0.33MnO3 by small angle magnetic neutron scattering
Silvana Mercone, Vincent Hardy, Christine Martin +3
We have studied by small angle neutron scattering the evolution induced by the application of magnetic field of the coexistence of ferromagnetism (F) and antiferromagnetism (AF) in…
The vortex depinning transition in untwinned YBaCuO using complex impedance measurements
Alain Pautrat, Christophe Goupil, Charles Simon +3
We present surface impedance measurement of the vortex linear response in a large untwinned YBCO crystal. The depinning spectra obtained over a broad frequency range (100 Hz- 30 MH…
A study of flux lines lattice order and critical current with time of flight small angle neutron scattering
Alain Pautrat, Annie Brulet, Charles Simon +1
Small angle neutron scattering (SANS) is an historical technique to study the flux lines lattice (FLL) in a superconductor. Structural characteristics of the FLL can be revealed, p…
Coupled Negative magnetocapacitance and magnetic susceptibility in a Kagome staircase-like compound Co3V2O8
Natalia Bellido, Christine Martin, Charles Simon +1
The dielectric constant of the Kagome staircase-like Co3V2O8 polycrystalline compound has been measured as function of temperature and magnetic field up to 14T. It is found that th…
Magnetodielectric coupling in a triangular Ising lattice
Natalia Bellido, Charles Simon, Antoine Maignan
Dielectric constant measurement under magnetic field is an efficient technique to study the coupling between charges and spins in insulating materials. For magnetic oxides, the geo…
Why pinning by surface irregularities can explain the peak effect in transport properties and neutron diffraction results in NbSe2 and Bi-2212 crystals?
Charles Simon, Alain Pautrat, Christophe Goupil +6
The existence of a peak effect in transport properties (a maximum of the critical current as function of magnetic field) is a well-known but still intriguing feature of type II sup…
Multiferroicity and magnetoelectric coupling in α-CaCr2O4
Kiran Singh, Charles Simon, Pierre Toledano
Ferroelectricity in the incommensurate helical magnetic phase (below TN, 43K) of alpha CaCr2O4 has been confirmed by pyroelectric measurements. Magnetoelectric and magnetodielectri…
Anomaly in the dielectric response at the charge orbital ordering transition of crystalline Pr0.67Ca0.33MnO3
Silvana Mercone, Alexandre Wahl, Alain Pautrat +2
The complex impedance of a Pr0.67Ca0.33MnO3 crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50K-403K) and is found to be characteri…
Non-linear effects and Joule heating in I-V curves in manganites
Silvana Mercone, Raymond Fresard, Vincent Caignaert +6
We study the influence of the Joule effect on the non-linear behavior of the transport I-V curves in polycrystalline samples of the manganite Pr0.8Ca0.2MnO3 by using the crystallin…
Magnetic and dielectric properties in the langasite-type compounds : A3BFe3D2O14 with A=Ba, Sr, Ca, B=Ta, Nb, Sb and D=Ge, Si
Karol Marty, Pierre Bordet, Virginie Simonet +9
The Fe-based langasites are the first reported compounds presenting a magnetic ordering in this rich family, besides being well known for piezo-electric properties and optical acti…
Magnetic field induced ferroelectric loop in Bi0.75Sr0.25FeO3
Bohdan Kundys, Antoine Maignan, Christine Martin +2
Magnetic field induced ferroelectric hysteresis loop observed in Bi0.75Sr0.25FeO3-delta is of prime importance. The coexistence of antiferromagnetism and weak ferromagnetism is res…
Understanding critical currents in superconducting cuprate tapes
Charles Simon
One of the key challenges in the fabrication of superconducting coils using cuprate tapes is the parametrization of the critical currents and their dependence on magnetic field, te…
Large increase of the Curie temperature by orbital ordering control
Aymeric Sadoc, Bernard Mercey, Charles Simon +3
Using first principle calculations we showed that the Curie temperature of manganites thin films can be increased by far more than an order of magnitude by applying appropriate str…
Analysis of the multiferroicity in the hexagonal manganite YMnO3
Kiran Singh, Marie-Bernadette Lepetit, Charles Simon +4
We performed magnetic and ferroelectric measurements, associated with Landau theory and symmetry analysis, in order to clarify the situation of the YMnO3 system, a classical exampl…
Unusual upper critical field in UTe2 revealed by magnetotransport measurements up to 42 T
Macha Méplan, Ilya Sheikin, Pierre Pugnat +16
The heavy-fermion superconductor UTe2 is unique in that, at ambient pressure, it exhibits three distinct superconducting phases, two of which are induced by magnetic field. When th…