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Письма в Журнал экспериментальной и теоретической физики, 2004, том 80, выпуск 5, страницы 403–407
(Mi jetpl2111)
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Эта публикация цитируется в 5 научных статьях (всего в 5 статьях)
КОНДЕНСИРОВАННЫЕ СРЕДЫ
Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite
S. N. Gvasaliyaab, B. Roesslia, R. A. Cowleyc, S. G. Lushnikovb, A. Choubeyd, P. Günterd a Laboratory for Neutron Scattering ETHZ, Paul
Scherrer Institut CH-5232 Villigen PSI Switzerland
b Ioffe Physical Technical Institute, 194021, St. Petersburg, Russia
c Clarendon Laboratory, Oxford University
d Nonlinear Optics Laboratory, ETH Hönggerberg, CH-8093 Z\"urich, Switzerland
Аннотация:
The low-energy part of the vibration spectrum in KNbO$_3$ was studied by cold neutron inelastic scattering in the cubic phase. In addition to acoustic phonons, we observe strong diffuse scattering, which consists of two components. The first one is quasi-static and has a temperature-independent intensity. The second component appears as quasi-elastic scattering in the neutron spectrum indicating a dynamic origin. From analysis of the inelastic data we conclude that the quasi-elastic component and the acoustic phonon are mutually coupled. The susceptibility associated with the quasi-elastic component grows as the temperature approaches $T_C$.
Поступила в редакцию: 27.07.2004
Образец цитирования:
S. N. Gvasaliya, B. Roessli, R. A. Cowley, S. G. Lushnikov, A. Choubey, P. Günter, “Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite”, Письма в ЖЭТФ, 80:5 (2004), 403–407; JETP Letters, 80:5 (2004), 355–358
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl2111 https://www.mathnet.ru/rus/jetpl/v80/i5/p403
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