Date of this Version
Physical Review Letters
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.
Berlinsky, A., & Harris, A. (1978). Orientational Phases of Hydrogen Molecules on a Triangular Lattice. Physical Review Letters, 40 (24), 1579-1582. http://dx.doi.org/10.1103/PhysRevLett.40.1579
Date Posted: 20 August 2015
This document has been peer reviewed.