Quantum discrete ϕ4 model at finite temperatures: the mean-field phase diagram
V. V. Savkin, A. N. Rubtsov
Abstract
The quantum discrete ϕ4 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 Sn2P2S6, SrTiO3, and KH2PO4 are placed in the phase diagram of the model.
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