Quantum discrete $φ^4$ model at finite temperatures: the mean-field phase diagram

Details Quantum discrete $φ^4$ model at finite temperatures: the mean-field phase diagram Quantum discrete $φ^4$ model at finite temperatures: the mean-field phase diagram

2001-12-23

arxiv.org/abs/cond-mat/0112429v2

Physics

Condensed Matter

Statistical Mechanics

3 figures, figures were changed

Scientific paper

The quantum discrete $\phi ^4$ model at finite temperature is studied in the mean-field approximation. The phase diagrams are obtained for a wide range of the model parameters. The domains of applicability for the classical, quantum, and order-disorder limits are determined. It is shown that a remarkable part of the phase diagram is reproduced by the first quantum correction to the classical result. Parameters of Sn$_2$P$_2$S$_6$, SrTiO$_3$, and KH$_2$PO$_4$ are placed in the phase diagram of the model.

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