Quantum saturation of the order parameter and the dynamical soft mode in quartz

Authors: Romero F.J.¹; Salje E.K.H.²

Source: Journal of Physics: Condensed Matter, Volume 15, Number 2, 2003 , pp. 315-320(6)

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Abstract:

The temperature evolution of the static order parameter of -quartz and its soft-mode frequencies were determined at temperatures below 300 K. While these parameters follow classic Landau theory at higher temperatures, quantum saturation was found below room temperature with a characteristic quantum temperature of 187 K. A quantitative analysis gave a good agreement with the predictions of a ⁶model close to the displacive limit and a rather flat dispersion of the soft-mode branch. No indication of any effect of strong mode-mode coupling on the saturation behaviour was observed.

Language: English

Document Type: Miscellaneous

Affiliations: 1: Departamento de Física de la Materia Condensada, Universidad de Sevilla, PO Box 1065, 41080 Sevilla, Spain 2: Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

Publication date: 2003-01-01