Acoustic collective excitations and static dielectric response in incommensurate crystals with real order parameter

Dananić, V. and Bjeliš, Aleksa and Latković, M. (1999) Acoustic collective excitations and static dielectric response in incommensurate crystals with real order parameter. Fizika A, 8 (4). pp. 383-392. ISSN 1330-0008

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Abstract

Starting from the basic Landau model for the incommensurate-commensurate materials of the class I I, we derive the spectrum of collective modes for all (meta)stable states from the corresponding phase diagram. It is shown that all incommensurate states posses Goldstone modes with acoustic dispersions. The representation in terms of collective modes is also used in the calculation and discussion of static dielectric response for systems with the commensurate wave number in the center of the Brillouin zone.

Item Type: Article
Keywords: class I I incommensurate-commensurate materials, Landau model, spectrum of collective modes, Goldstone modes, dielectric response
Date: 1999
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 Apr 2014 18:08
Last Modified: 14 Apr 2014 18:08
URI: http://digre.pmf.unizg.hr/id/eprint/822

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