Orientational Phases of Hydrogen Molecules on a Triangular Lattice | Zendy

A. J. Berlinsky | Zendy; A. B. Harris | Zendy

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Orientational Phases of Hydrogen Molecules on a Triangular Lattice

Author(s) -

A. J. Berlinsky,

A. B. Harris

Publication year - 1978

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.40.1579

Subject(s) - phase diagram , hexagonal lattice , condensed matter physics , coupling constant , physics , molecule , lattice (music) , phase transition , lattice constant , quadrupole , mean field theory , phase (matter) , materials science , atomic physics , diffraction , quantum mechanics , antiferromagnetism , acoustics

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 firstand 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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