Department of Physics Papers

Document Type

Journal Article

Date of this Version

6-12-1978

Publication Source

Physical Review Letters

Volume

40

Issue

24

Start Page

1579

Last Page

1582

DOI

10.1103/PhysRevLett.40.1579

Abstract

A mean-field theory for the ordering of hydrogen molecules on a triangular net is derived in terms of the quadrupole coupling constant Γ, the crystal field Vc, and the temperature T. The phase diagram consists of six regions, separated by first- and second-order transitions. For almost all values of Vc/Γ for which ordering occurs, the disordered to ordered phase transition is continuous. At T=0 K, all phases have energy gaps except for a ferrorotational phase which behaves like an XY model.

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Date Posted: 20 August 2015

This document has been peer reviewed.