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
收藏
页码：5110 / 5115
页数：6
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