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

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

Fizika A (Zagreb), 8 (1999) 4, 383-392 Starting from the basic Landau model for the incommensurate-commensurate materials of the class II, 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 Go...

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Hauptverfasser: Dananic, V, Bjelis, A, Latkovic, M
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description Fizika A (Zagreb), 8 (1999) 4, 383-392 Starting from the basic Landau model for the incommensurate-commensurate materials of the class II, 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.
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title Acoustic collective excitations and static dielectric response in incommensurate crystals with real order parameter
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