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Incommensurate phase transitions

Abstract

We review the characteristic aspects of modulated crystals from the point of view of inelastic neutron scattering. We discuss the phenomenological Landau theory of the normal-to-incommensurate displacive instability and its predictions concerning the fluctuation spectrum of the modulated phase. General results on the form of the normal-mode eigenvectors and on the inelastic scattering channels through which they couple to the probe are established using the superspace approach. We illustrate these results on a simple discrete model symmetry and we review available inelastic neutron scattering data on several displacively modulated compounds. (author) 21 figs., 73 refs.
Authors:
Currat, R [1] 
  1. Institut Max von Laue - Paul Langevin (ILL), 38 - Grenoble (France)
Publication Date:
Nov 01, 1996
Product Type:
Miscellaneous
Report Number:
PSI-PROC-96-02; CONF-9608191-
Reference Number:
SCA: 665100; PA: AIX-28:024557; EDB-97:076555; SN: 97001789416
Resource Relation:
Conference: 4. summer school on neutron scattering, Zuoz (Switzerland), 18-24 Aug 1996; Other Information: PBD: Nov 1996; Related Information: Is Part Of New instruments and science around SINQ. Lecture notes of the 4. summer school on neutron scattering; Furrer, A. [ed.]; PB: 454 p.; PSI-Proceedings 96-02
Subject:
66 PHYSICS; NEUTRONS; INELASTIC SCATTERING; PHASE TRANSFORMATIONS; BIPHENYL; DEUTERIUM COMPOUNDS; EXPERIMENTAL DATA; PHONONS; SODIUM NITRIDES; THORIUM BROMIDES
OSTI ID:
475550
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1019-6447; Other: ON: DE97623521; TRN: CH9700049024557
Availability:
OSTI as DE97623521
Submitting Site:
CHN
Size:
pp. 265-292
Announcement Date:

Citation Formats

Currat, R. Incommensurate phase transitions. Switzerland: N. p., 1996. Web.
Currat, R. Incommensurate phase transitions. Switzerland.
Currat, R. 1996. "Incommensurate phase transitions." Switzerland.
@misc{etde_475550,
title = {Incommensurate phase transitions}
author = {Currat, R}
abstractNote = {We review the characteristic aspects of modulated crystals from the point of view of inelastic neutron scattering. We discuss the phenomenological Landau theory of the normal-to-incommensurate displacive instability and its predictions concerning the fluctuation spectrum of the modulated phase. General results on the form of the normal-mode eigenvectors and on the inelastic scattering channels through which they couple to the probe are established using the superspace approach. We illustrate these results on a simple discrete model symmetry and we review available inelastic neutron scattering data on several displacively modulated compounds. (author) 21 figs., 73 refs.}
place = {Switzerland}
year = {1996}
month = {Nov}
}