Theoretical evidence for a reentrant phase diagram in {\em ortho-para} mixtures of solid H$_2$

Details Theoretical evidence for a reentrant phase diagram in {\em ortho-para} mixtures of solid H$_2$ Theoretical evidence for a reentrant phase diagram in {\em ortho-para} mixtures of solid H$_2$

2005-03-02

arxiv.org/abs/cond-mat/0503043v1

Phys. Rev. Lett. 94 125503 (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.125503

We develop a multi order parameter mean-field formalism for systems of coupled quantum rotors. The scheme is developed to account for systems where {\it ortho-para} distinction is valid. We apply our formalism to solid H$_2$ and D$_2$. We find an anomalous {\it reentrant} orientational phase transition for both systems at thermal equilibrium. The correlation functions of the order parameter indicate short-range order at low temperatures. As temperature is increased the correlation increases along the phase boundary. We also find that even extremely small {\it odd-J} concentrations (1%) can trigger short-range orientational ordering.

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