E. Farhi, B. Hehlen, R. Currat, E. Courtens
Abstract Low-T Brillouin spectra of the incipient ferroelectric KTaO 3 exhibit a broad central peak (CP), and additional Brillouin doublets (BD), that can both be related to phonon-density...
Ktao Under K, E. Farhi, A. K. Tagantsev, R. Currat, B. Hehlen, E. Courtens
(will be inserted by the editor) Low energy phonon spectrum and its parameterization in pure
The SrTiO$_3$ displacive transition revisited by Coherent X-ray Diffraction (2006)
Ravy, S., Bolloc'h, D. Le, Currat, R., Fluerasu, A., Mocuta, C., Dkhil, B.
We present a Coherent X-ray Diffraction study of the antiferrodistortive displacive transition of SrTiO$_3$, a prototypical example of a phase transition for which the critical fluctuations exhibit...
Dynamics of long-wavelength phason fluctuations in the i-Al-Pd-Mn quasicrystal (2006)
Francoal, S., Livet, F., M. De, Boissieu, Yakhou, F., Bley, F., Letoublon, A., ...
Ayari, A., Danneau, R., Requardt, H., Ortega, L., Lorenzo, J., Monceau, P., ...
Using high-resolution x-ray scattering, in the temperature range 40 K
Ayari, A., Danneau, R., Requardt, H., Ortega, L., Monceau, P., ...
Using high-resolution x-ray scattering in the presence of an applied current, we report evidence for a dynamical decoupling between the two NbSe3 charge-density waves (CDWs), Q1 (TC1 = 145 K) and Q2...
Sound modes broadening in quasicrystals (2003)
De Boissieu, M., Currat, R., Francoual, S., Kats, E.
We propose a simple phenomenological model to analyze vibrational characteristics of quasicrystals (QCs). The interpretation of the obtained recently data is based on the existence of almost...
Sound modes in composite incommensurate crystals (2002)
Currat, R., Kats, E. I., Luk'yanchuk, I.
We propose a simple phenomenological model describing composite crystals, constructed from two parallel sets of periodic inter-penetrating chains. In the harmonic approximation and neglecting thermal...
Rideau,D., Monceau,P., Currat,R., Requardt,H., Nad,F., Lorenzo,J. E., ...
Low-T ferroelectricity in antiphase domain boundaries of SrTiO3 (2002)
Arzel, L., Hehlen, B., Tagantsev, A. K., Denoyer, F., Liss, K. D., Currat, R., ...
The ferroelectric transition of bulk strontium titanate is suppressed by a combination of two effects: (1) the structural changes produced by the antiferrodistortive transition at T-a =105 K and (2)...
Rideau,D., Monceau,P., Currat,R., Requardt,H., Nad,F., Lorenzo,J. E., ...
Rideau,D., Monceau,P., Currat,R., Requardt,H., Nad,F., Lorenzo,J. E., ...
Low energy phonon spectrum and its parameterization in pure KTaO3 under 80 K (2000)
Farhi, E., Tagantsev, A. K., Currat, R., Hehlen, B., Courtens, E., Boatner, L. A.
High resolution data on low energy phonon branches (acoustic and soft optic) along the three principal symmetry axes in pure KTaO3 were obtained by cold neutron inelastic scattering between 10 and 80...
Farhi, E., Tagantsev, A. K., Hehlen, B., Currat, R., Boatner, L. A., Courtens, E.
Low-T Brillouin spectra of the incipient ferroelectric KTaO3 exhibit a broad central peak (CP), and additional Brillouin doublets (BD), that can both be related to phonon-density fluctuations. On the...
The broad Brillouin doublets and central peak of KTaO_3 (2000)
Farhi, E., Tagantsev, A. K., Hehlen, B., Currat, R., Boatner, L. A., Courtens, E.
The incipient ferroelectric KTaO3 presents low-T Brillouin spectra anomalies,e.g. a broad central peak (CP), and some additional Brillouin doublets (BD), whose origin is interpreted in terms of...
Rideau, D., Monceau, P., Currat, R., Requardt, H., Nad, F., Lorenzo, J. E., ...
Using high-resolution X-ray scattering techniques, we measure the variation, q(x), of the position in reciprocal space of the CDW satellite, in the sliding state, along the length of NbSe_3 whiskers....
Phase slippage at the interface: normal metal/sliding charge-density wave (2000)
Rideau,D., Monceau,P., Requardt,H., Currat,R., Nad,F., Lorenzo,J. E., ...
Phase slippage at the interface: normal metal/sliding charge-density wave (2000)
Rideau, D., Monceau, P., Requardt, H., Currat, R., Nad, F., Lorenzo, J. E., ...
Low energy phonon spectrum and its parameterization in pure KTaO3 below 80 K (2000)
Farhi, E., Tagantsev, A. K., Currat, R., Hehlen, B., Courtens, E., Boatner, L. A.
High resolution data on low energy phonon branches (acoustic and soft optic) along the three principal symmetry axes in pure KTaO3 were obtained by cold neutron inelastic scattering between 10 and 80...
Farhi, E., Tagantsev, A. K., Hehlen, B., Currat, R., Boatner, L. A., Courtens, E.
Low-T Brillouin spectra of the incipient ferroelectric KTaO3 exhibit a broad central peak (CP), and additional Brillouin doublets (BD), that can both be related to phonon-density fluctuations. On the...
The broad Brillouin doublets and central peak of KTaO3 (2000)
Farhi, E., Tagantsev, A. K., Hehlen, B., Currat, R., Boatner, L. A., Courtens, E.
The incipient ferroelectric KTaO3 presents low-T Brillouin spectra anomalies, e.g. a broad central peak (CP), and some additional Brillouin doublets (BD). whose origin are interpreted in terms of...
Soft mode behaviour of incommensurate Sn2P2Se6: An inelastic neutron scattering study (1997)
Vysochanskii, Y.M., Hennion, B., SaintGregoire, P., Katano, S., Lorenzo, J.E., Currat, R., ...
Anomalous features of the CDW transition in metallic 2H dichalcogenides (1993)
Ayache, C., Currat, R., Hennion, B., Molinie, P.
The metallic dichalcogenides of transition metals which cystallise in the trigonal prismatic 2H structure, are considered as a model family for the study of charge-density-wave transitions of the...
Neutron study of the Peierls transition and low-frequency excitations in (TaSe4)2I (1993)
Currat, R., Lorenzo-Diaz, J., Monceau, P., Hennion, B., Levy, F.
No abstract available
Anomalous features of the CDW transition in metallic 2H dichalcogenides (1993)
Ayache, C., Currat, R., Hennion, B., Molinie, P.
The metallic dichalcogenides of transition metals which cystallise in the trigonal prismatic 2H structure, are considered as a model family for the study of charge-density-wave transitions of the...
Neutron study of the Peierls transition and low-frequency excitations in (TaSe4)2I (1993)
Currat, R., Lorenzo-Diaz, J., Monceau, P., Hennion, B., Levy, F.
No abstract available
Anomalous features of the CDW transition in metallic 2H dichalcogenides (1993)
Ayache, C., Currat, R., Hennion, B., Molinie, P.
The metallic dichalcogenides of transition metals which cystallise in the trigonal prismatic 2H structure, are considered as a model family for the study of charge-density-wave transitions of the...
Neutron study of the Peierls transition and low-frequency excitations in (TaSe4)2I (1993)
Currat, R., Lorenzo-Diaz, J., Monceau, P., Hennion, B., Levy, F.
No abstract available
Barthes, M., Almairac, R., Sauvajol, J., Currat, R., Moret, J., Ribet, J.
Crystalline acetanilide (ACN) is ananharmonic solid characterised by soft hydrogen bonded chains of molecules. Anomalies in the I. R. and Raman mode spectra were recently observed at low temperature....
Barthes, M., Almairac, R., Sauvajol, J., Currat, R., Moret, J., Ribet, J.
Crystalline acetanilide (ACN) is ananharmonic solid characterised by soft hydrogen bonded chains of molecules. Anomalies in the I. R. and Raman mode spectra were recently observed at low temperature....
Barthes, M., Almairac, R., Sauvajol, J., Currat, R., Moret, J., Ribet, J.
Crystalline acetanilide (ACN) is ananharmonic solid characterised by soft hydrogen bonded chains of molecules. Anomalies in the I. R. and Raman mode spectra were recently observed at low temperature....
Structure of the modulation in thiourea. II. Structure refinement (1988)
Simonson, T., Dénoyer, F., Currat, R., Vettier, C.
We describe structure refinement of the long-period, commensurate, q = b*/9 phase of thiourea, using neutron diffraction data and the model derived in a previous paper. The primary distorsion wave...
Structure of the modulation in thiourea. II. Structure refinement (1988)
Simonson, T., Dénoyer, F., Currat, R., Vettier, C.
We describe structure refinement of the long-period, commensurate, q = b*/9 phase of thiourea, using neutron diffraction data and the model derived in a previous paper. The primary distorsion wave...
Structure of the modulation in thiourea. II. Structure refinement (1988)
Simonson, T., Dénoyer, F., Currat, R., Vettier, C.
We describe structure refinement of the long-period, commensurate, q = b*/9 phase of thiourea, using neutron diffraction data and the model derived in a previous paper. The primary distorsion wave...
On the symmetry properties of the incommensurate phase of thiourea (1987)
Simonson, T., Ddnoyer, F., Currat, R.
The free energy of the incommensurate phase of thiourea is minimized qualitatively. Two classes of solutions with different symmetry properties are found and discussed. These correspond to...
On the symmetry properties of the incommensurate phase of thiourea (1987)
Simonson, T., Ddnoyer, F., Currat, R.
The free energy of the incommensurate phase of thiourea is minimized qualitatively. Two classes of solutions with different symmetry properties are found and discussed. These correspond to...
On the symmetry properties of the incommensurate phase of thiourea (1987)
Simonson, T., Ddnoyer, F., Currat, R.
The free energy of the incommensurate phase of thiourea is minimized qualitatively. Two classes of solutions with different symmetry properties are found and discussed. These correspond to...
Search for charge-density waves in potassium by neutron diffraction. (1987)
Pintschovius, L., Blaschko, O., Krexner, G., De Podesta, M., Currat, R.
Physical Review B, 35(1987) S.9330-32
Structure of the modulation in thiourea. I. symmetry properties (1985)
Simonson, T., Dénoyer, F., Currat, R.
This is the first part of a structural study of the modulation in thiourea. The modulation is described by a normal mode Qq of τ 4 symmetry along with harmonic modes Q2q, Q3q, ... Corresponding...
Structure of the modulation in thiourea. I. symmetry properties (1985)
Simonson, T., Dénoyer, F., Currat, R.
This is the first part of a structural study of the modulation in thiourea. The modulation is described by a normal mode Qq of τ 4 symmetry along with harmonic modes Q2q, Q3q, ... Corresponding...
Structure of the modulation in thiourea. I. symmetry properties (1985)
Simonson, T., Dénoyer, F., Currat, R.
This is the first part of a structural study of the modulation in thiourea. The modulation is described by a normal mode Qq of τ 4 symmetry along with harmonic modes Q2q, Q3q, ... Corresponding...
Neutron diffraction study of sodium nitrite in an applied electric field (1983)
Durand, D., Denoyer, F., Lefur, D., Currat, R., Bernard, L.
The phase diagram of NaNO2 in an applied electric field is investigated by means of neutron diffraction. No evidence is found for field-induced commensurate phases. For an applied field of 3.4 kV...
Neutron scattering investigation of incommensurate ThBr$_4$ (1983)
Bernard, L., Currat, R., Zeyen, C.M.E., Delamoye, P., Hubert, S., Kouchkovsky, R. De
Neutron scattering investigation of incommensurate ThBr$_4$ (1983)
Bernard, L., Currat, R., Zeyen, C.M.E., Delamoye, P., Hubert, S., Kouchkovsky, R. De
Neutron diffraction study of sodium nitrite in an applied electric field (1983)
Durand, D., Denoyer, F., Lefur, D., Currat, R., Bernard, L.
The phase diagram of NaNO2 in an applied electric field is investigated by means of neutron diffraction. No evidence is found for field-induced commensurate phases. For an applied field of 3.4 kV...
Neutron diffraction study of sodium nitrite in an applied electric field (1983)
Durand, D., Denoyer, F., Lefur, D., Currat, R., Bernard, L.
The phase diagram of NaNO2 in an applied electric field is investigated by means of neutron diffraction. No evidence is found for field-induced commensurate phases. For an applied field of 3.4 kV...
Etude par rayons X et par neutrons de la phase incommensurable du nitrite de sodium (1982)
Durand, D., Denoyer, F., Lambert, M., Bernard, L., Currat, R.
Nous présentons les résultats obtenus en diffraction de rayons X sur le nitrite de sodium : nous nous sommes principalement intéressés à la localisation des satellites et de la diffusion diffuse...
Crystal-field transitions associated with U4+ impurities diluted in ThBr4 give rise to broad absorption bands characterized by edge singularities. We show that the experimental spectra are consistent...
Etude par rayons X et par neutrons de la phase incommensurable du nitrite de sodium (1982)
Durand, D., Denoyer, F., Lambert, M., Bernard, L., Currat, R.
Nous présentons les résultats obtenus en diffraction de rayons X sur le nitrite de sodium : nous nous sommes principalement intéressés à la localisation des satellites et de la diffusion diffuse...
Crystal-field transitions associated with U4+ impurities diluted in ThBr4 give rise to broad absorption bands characterized by edge singularities. We show that the experimental spectra are consistent...
Etude par rayons X et par neutrons de la phase incommensurable du nitrite de sodium (1982)
Durand, D., Denoyer, F., Lambert, M., Bernard, L., Currat, R.
Nous présentons les résultats obtenus en diffraction de rayons X sur le nitrite de sodium : nous nous sommes principalement intéressés à la localisation des satellites et de la diffusion diffuse...
Crystal-field transitions associated with U4+ impurities diluted in ThBr4 give rise to broad absorption bands characterized by edge singularities. We show that the experimental spectra are consistent...
Crystal-field transitions associated with U4+ impurities diluted in ThBr4 give rise to broad absorption bands characterized by edge singularities. We show that the experimental spectra are consistent...
Joffrin, C., Benoit, J.P., Currat, R., Lambert, M.
L'étude de la transition ferroélastique du phosphate de plomb par diffusion inélastique des neutrons a montré la présence dans la phase haute température d'un mode optique de bord de zone dont...
Joffrin, C., Benoit, J.P., Currat, R., Lambert, M.
L'étude de la transition ferroélastique du phosphate de plomb par diffusion inélastique des neutrons a montré la présence dans la phase haute température d'un mode optique de bord de zone dont...
Joffrin, C., Benoit, J.P., Currat, R., Lambert, M.
L'étude de la transition ferroélastique du phosphate de plomb par diffusion inélastique des neutrons a montré la présence dans la phase haute température d'un mode optique de bord de zone dont...
Investigations on the dynamics and structure of solids. (1979)
Assmus, W., Burkin, J., Buschow, K.H.J., Christensen, A.N., Currat, R., Estel, J., ...
In: Progress Report. Teilinstitut Nukleare Festkoerperphysik des Instituts fuer Angewandte Kernphysik. 1.6.1978 - 31.5.1979
Acoustic phonons in polysulfur nitride, (SN)(sub x). (1978)
Pintschovius, L., Currat, R., Wendel, H.
Balkanski, M.[Hrsg.]: Lattice Dynamics. Proc.of the Internat.Conf., Paris, September 5-9, 1977. Paris: Flammarion 1978. S.579-81
Acoustic phonons in polymeric sulfur nitride, (SN)(sub x). (1978)
Pintschovius, L., Wendel, H., Currat, R.
7.Europhysics Conf.on Macromolecular Physics: Structure and Dynamics of Polymers - Neutron Scattering Experiments and New Theoretical Approaches, Strasbourg, France, May 23-26, 1978
Investigations on the dynamics of solids and liquids. (1978)
Anderko, K., Baumann, F., Block, R., Buerkin, J., Burger, N., Christensen, A.N., ...
In: Progress Report. Teilinstitut Nukleare Festkoerperphysik. 1.6.1977-31.5.1978
Investigations on the dynamics of solids and liquids. (1977)
Block, R., Christensen, A.N., Currat, R., Daubert, J., Freyland, W., Geibel, Ch., ...
In: Progress Report of the Teilinstitut Nukleare Festkoerperphysik. 1.6.1976 - 31.5.1977. KFK-2538 (Oktober 77) S.1-46
Acoustic phonons of polysulfur nitride, (SN)(x). (1976)
Pintschovius, L., Currat, R., Kahlert, H.
Internat.Conference on Organic Conductors and Semiconductors, Siofok/Ung., August 30 - September 3, 1976
Investigations on the dynamics of solids and liquids. (1976)
Abel, W., Bader, S.D., Block, R., Christensen, A.N., Currat, R., Dietrich, M., ...
In: Progress Report of the Teilinstitut Nukleare Festkoerperphysik. 1.6.1975 - 31.5.1976
Comes, R., Renker, B., Pintschovius, L., Currat, R., Glaeser, W., Schreiber, G.
Physica Status Solidi (b), 71(1975) S. 171-78