Publications (31)
Raman scattering of perovskite SmScO3 and NdScO3 single crystals
O. Chaix-Pluchery, J. Kreisel
We report an investigation of perovskite-type SmScO3 and NdScO3 single crystals by Raman scattering in various scattering configurations and at different wavelengths. The reported…
Temperature-dependent Raman scattering of DyScO3 and GdScO3 single crystals
O. Chaix-Pluchery, D. Sauer, J. Kreisel
We report a temperature-dependent Raman scattering investigation of DyScO3 and GdScO3 single crystals from room temperature up to 1200 °C. With increasing temperature, all modes d…
Coupling between phonons and magnetic excitations in orthorhombic Eu_{1-x}Y_xMnO_3
J. Agostinho Moreira, A. Almeida, W. S. Ferreira +4
In this work we present a detailed study of the structural and lattice dynamic properties of Y-doped EuMnO3 ceramics (Eu1-xYxMnO3, with 0<x<0.55). A thorough analysis towards the c…
Control of surface potential at polar domain walls in a nonpolar oxide
G. F. Nataf, M. Guennou, J. Kreisel +8
Ferroic domain walls could play an important role in microelectronics, given their nanometric size and often distinct functional properties. Until now, devices and device concepts…
Probing individual layers in functional oxide multilayers by wavelength-dependent Raman scattering
J. Kreisel, M. C. Weber, N. Dix +3
Integration of functional oxides on silicon requires the use of complex heterostructures involving oxides of which the structure and properties strongly depend on the strain state…
Strain analysis of multiferroic BiFeO3-CoFe2O4 nanostructures by Raman scattering
O. Chaix-Pluchery, C. Cochard, P. Jadhav +4
We report a Raman scattering investigation of columnar BiFeO3-CoFe2O4 (BFO-CFO) epitaxial thin film nanostructures, where BFO pillars are embedded in a CFO matrix. The feasibility…
Multiple strain-induced phase transitions in LaNiO3 thin films
M. C. Weber, M. Guennou, N. Dix +9
Strain effects on epitaxial thin films of LaNiO3 grown on different single crystalline substrates are studied by Raman scattering and first-principles simulation. New Raman modes,…
Temperature-dependent Raman scattering of KTa1-xNbxO3 thin films
A. Bartasyte, J. Kreisel, W. Peng +1
We report a Raman scattering investigation of KTa1-xNbxO3 (x = 0.35, 0.5) thin films deposited on MgO and LaAlO3 as a function of temperature. The observed phase sequence in the ra…
SmNiO3/NdNiO3 thin film multilayers
C. Girardot, S. Pignard, F. Weiss +1
Rare earth nickelates RENiO3 which attract interest due to their sharp metal-insulator phase transition, are instable in bulk form due to the necessity of an important oxygen press…
Phonon Raman scattering of RCrO3 perovskites (R = Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)
M. Weber, J. Kreisel, P. A. Thomas +3
We report a systematic investigation of orthorhombic perovskite-type RCrO3 powder samples by Raman scattering for nine different rare earth R3+ cations (R = Y, La, Pr, Sm, Gd, Dy,…
Raman scattering of perovskite DyScO3 and GdScO3 single crystals
O. Chaix-Pluchery, J. Kreisel
We report an investigation of DyScO3 and GdScO3 single crystals by Raman scattering in various scattering configurations and at various wavelengths. The Raman spectra are well-defi…
Crossover in the pressure evolution of elementary distortions in RFeO3 perovskites and its impact on their phase transition
R. Vilarinho, P. Bouvier, M. Guennou +9
This work reports on the pressure dependence of the octahedra tilts and mean Fe-O bond lengths in RFeO3 (R=Nd, Sm, Eu, Gd, Tb and Dy), determined through synchrotron X-ray diffract…
Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
C. Toulouse, J. Fischer, S. Farokhipoor +13
Helium implantation in epitaxial thin films is a way to control the out-of-plane deformation independently from the in-plane strain controlled by epitaxy. In particular, implantati…
Magentically-Induced Lattice Distortions and Ferroelectricity in Magnetoelectric GdMnO3
J. Agostinho Moreira, A. Almeida, J. Oliveira +4
In this work we investigate the magnetic field dependence of Ag octahedra rotation (tilt) and B2g symmetric stretching modes frequency at different temperatures. Our field-dependen…
Phase transitions and ferroelectrics: revival and the future in the field
J. Kreisel, B. Noheda, B. Dkhil
It appeared worthwhile to us to present a state-of-the-art look at the field of ferroelectrics. We are certainly not attempting to provide a complete review of all aspects of the f…
Structural and insulator-to-metal phase transition at 50 GPa in GdMnO3
J. Agostinho Moreira, A. Almeida, J. Oliveira +6
We present a study of the effect of very high pressure on the orthorhombic perovskite GdMnO3 by Raman spectroscopy and synchrotron x-ray diffraction up to 53.2 GPa. The experimenta…
Structural distortion and magnetism of BiFeO3 epitaxial thin films: a Raman spectroscopy and neutron diffraction study
H. Bea, M. Bibes, S. Petit +2
A previous study of the growth conditions has shown that single-phase BiFeO3 thin films can only be obtained in a narrow pressure-temperature window and that these films display a…
Phase transition close to room temperature in BiFeO3 thin films
J. Kreisel, P. Jadhav, O. Chaix-Pluchery +4
BiFeO3 (BFO) multiferroic oxide has a complex phase diagram that can be mapped by appropriately substrate-induced strain in epitaxial films. By using Raman spectroscopy, we conclus…
Temperature-dependent photo-response in multiferroic BiFeO revealed by transmission measurements
F. Meggle, M. Viret, J. Kreisel +1
We studied the light-induced effects in BiFeO single crystals as a function of temperature by means of optical spectroscopy. Here we report the observation of several light-ind…
High pressure phases in highly piezoelectric Pb(Zr0.52Ti0.48)O3
A. Sani, B. Noheda, I. A. Kornev +3
Two novel room-temperature phase transitions are observed, via synchrotron x-ray diffraction and Raman spectroscopy, in the Pb(Zr0.52Ti0.48)O3 alloy under hydrostatic pressures up…
Colossal Spin-Phonon Anomalies and the Ferroelectric Phase Transition in the Model Multiferroic Bifeo3
R. Haumont, J. Kreisel, P. Bouvier +1
We report a temperature-dependent Raman and neutron scattering investigation of the multiferroic material bismuth ferrite BiFeO3 (BFO).
Pressure-induced phase transitions in the multiferroic perovskite BiFeO3 studied by far-infrared micro-spectroscopy
A. Pashkin, K. Rabia, S. Frank +4
We present the results of pressure-dependent far-infrared reflectivity measurements on the multiferroic perovskite BiFeO3 at room temperature. The observed behavior of the infrared…
EXAFS study of lead-free relaxor ferroelectric BaTi(1-x)Zr(x)O3 at the Zr K-edge
C. Laulhe, F. Hippert, J. Kreisel +4
Extended X-ray absorption fine structure (EXAFS) experiments at the Zr K-edge were carried out on perovskite relaxor ferroelectrics BaTi(1-x)Zr(x)O3 (BTZ) (x = 0.25, 0.30, 0.35), a…
Optical spectroscopy on the photo-response in multiferroic BiFeO at high pressure
F. Meggle, J. Ebad-Allah, J. Kreisel +1
The pressure dependence of light-induced effects in single-crystalline BiFeO is studied by optical spectroscopy. At low pressures, we observe three light-induced absorption fea…
Raman scattering investigation across the magnetic and MI transition in rare earth nickelate RNiO3 (R = Sm, Nd) thin films
C. Girardot, J. Kreisel, S. Pignard +2
We report a temperature-dependent Raman scattering investigation of thin film rare earth nickelates SmNiO3, NdNiO3 and Sm0.60Nd0.40NiO3, which present a metal-to-insulator (MI) tra…
Effect of high pressure on multiferroic BiFeO3
R. Haumont, P. Bouvier, A. Pashkin +6
We report experimental evidence for pressure instabilities in the model multiferroic BiFeO3 and namely reveal two structural phase transitions around 3 GPa and 10 GPa by using diff…
Strong magneto-elastic coupling and polar properties in orthorhombic Eu1-xYxMnO3 manganite
J. Agostinho Moreira, A. Almeida, W. S. Ferreira +8
This work reports an experimental investigation of the magneto-elastic coupling and polarization character of magnetic phases of the orthorhombic Eu1-xYxMnO3 system at low temperat…
Infrared and THz studies of polar phonons and improper magnetodielectric effect in multiferroic BFO3 ceramics
S. Kamba, D. Nuzhnyy, M. Savinov +5
BFO3 ceramics were investigated by means of infrared reflectivity and time domain THz transmission spectroscopy at temperatures 20 - 950 K, and the magnetodielectric effect was stu…
Dynamic and structural properties of orthorhombic rare-earth manganites under high pressure
D. A. Mota, A. Almeida, V. H. Rodrigues +6
We report a high-pressure study of orthorhombic rare-earth manganites AMnO3 using Raman scattering (for A = Pr, Nd, Sm, Eu, Tb and Dy) and synchrotron X-ray diffraction (for A = Pr…
Giant Strain Tunability in Polycrystalline Ceramic Films via Helium Implantation
A. Blà zquez MartÃnez, S. GlinÅ¡ek, T. Granzow +5
Strain engineering is a powerful tool routinely used to control and enhance properties such as ferroelectricity, magnetic ordering, or metal-insulator transitions. Epitaxial strain…
Phonon Raman scattering of perovskite LaNiO3 thin films
N. Chaban, M. Weber, S. Pignard +1
We report an investigation of perovskite-type LaNiO3 thin films by Raman scattering in both various scattering configurations and as a function of temperature. The room-temperature…