Theory of the mechanisms of pressure-induced phase transitions in oxygen

Katzke, H. and Toledano, P. (2009) Theory of the mechanisms of pressure-induced phase transitions in oxygen Physical Review B, 79 (14). DOI 14010110.1103/PhysRevB.79.140101.

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Abstract

A theoretical description is proposed for the transition mechanisms relating the different phases of oxygen. In contrast to the current view, the antiferromagnetic order existing in the alpha and delta phases is shown to be structurally driven by the spontaneous deformations taking place at the beta ->alpha and beta ->delta transitions. The structural mechanism giving rise to (O(2))(4) clusters in the high-pressure epsilon phase is described and shown to be correlated with the magnetic collapse occurring at the delta ->epsilon transition. The large intermediate region of coexistence between the epsilon and yet unknown higher-pressure zeta structures is suggested to correspond to a low-symmetry ferroelastic phase.

Document Type: Article
Keywords: antiferromagnetic materials deformation ferroelastic transitions high-pressure effects magnetic transitions oxygen solid-state phase transformations solid oxygen gpa
Research affiliation: Kiel University
DOI etc.: 14010110.1103/PhysRevB.79.140101
ISSN: 1098-0121
Date Deposited: 22 Dec 2011 05:48
Last Modified: 08 Oct 2012 10:09
URI: http://eprints.uni-kiel.de/id/eprint/15786

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