This article is cited in 5 papers

Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX) (Moscow, Russia, June 19-23, 2011

Landau potential of a KDP crystal in the cluster approximation of the pseudospin model

V. A. Abalmassov, A. S. Yurkov

Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: A relation between the microscopic and phenomenological descriptions of the ferroelectric phase transition in a KDP crystal has been considered. The microscopic description has used the pseudospin model in the cluster approximation taking into account tunneling of a proton on a hydrogen bond and yields the Landau potential. The temperature dependence of the coefficients of the first terms in the expansion of the Landau potential in powers of a small order parameter is presented graphically. The calculation results are given for positive and negative values of the long-range interaction parameter $\gamma$ of the microscopic theory, and their difference is emphasized.

 English version: Physics of the Solid State, 2012, 54:5, 984–986

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