Structural mechanisms and order-parameter symmetries for the high-pressure phase transitions in alkali metals

Katzke, H. and Toledano, P. (2005) Structural mechanisms and order-parameter symmetries for the high-pressure phase transitions in alkali metals Physical Review B, 71 (18). DOI 18410110.1103/PhysRevB.71.184101.

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Abstract

The structural transitions occurring between the high-pressure phases of alkali metals are described by displacive mechanisms. The different structures are associated with critical instabilities of the ambient-pressure body-centered-cubic structure. Unifying mechanisms are found for the transitions occurring in (Li and Na) and (K, Rb and Cs), respectively. The RbIII-RbIV-RbV and CsIII-CsIV phase sequences are interpreted as reflecting the hybridization process of the s- and d-wave functions, which induces a deformation of the atomic shells, allowing a closer packing of the KIII, RbIV, and RbV structures. The RbIII and CsIII structures are proposed to represent commensurate approximations of incommensurately modulated structures locking in at the RbV and CsIV phases.

Document Type: Article
Keywords: lithium cesium
Research affiliation: Kiel University
DOI etc.: 18410110.1103/PhysRevB.71.184101
ISSN: 1098-0121
Date Deposited: 18 Jan 2012 05:09
Last Modified: 08 Oct 2012 10:26
URI: http://eprints.uni-kiel.de/id/eprint/16061

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