PHASE-DIAGRAM OF A HEXAGONAL MODEL WITH INCOMMENSURATE PHASES

被引：15

作者：

PARLINSKI, K

KWIECINSKI, S

URBANSKI, A

机构：

[1] Institute of Nuclear Physics, 31-342 Cracow

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.46.5110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A hexagonal two-dimensional model of particles with displacive degrees of freedom and interacting via a potential with harmonic and anharmonic third- and fourth-order terms has been considered. The calculated phase diagram has incommensurate and commensurate phases with both one-dimensional 1q and two-dimensional 3q modulations. The incommensurate 3q phase proves to be stable in the presence of the third-order anharmonic term and close to the phase boundary of the normal phase. The commensurate phases with 1q and 3q modulations, characterized by the wave vector 1/3, are found to be degenerate and stable in the same region of the phase diagram.

引用

页码：5110 / 5115

页数：6

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