ANHARMONIC CONTRIBUTION TO MODE SOFTENING IN V3SI

被引：10

作者：

ACHAR, BNN ^{[1
]}

BARSCH, GR ^{[1
]}

机构：

[1] PENN STATE UNIV, MAT RES LAB, UNIVERSITY PK, PA 16802 USA

来源：

PHYSICAL REVIEW B | 1979年 / 19卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.19.3761

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to assess the magnitude and significance of anharmonic effects in V3Si the Landau theory of Bhatt and McMillan for the coupled-mode charge-density wave instability has been extended to higher order. The higher-order coupling parameters are determined empirically and are used to calculate nine second- through fourth-order elastic constants as a function of temperature. The nonlinear stress-strain curve calculated from these results is in good agreement with the experimental data of Patel and Batterman. The elastic-shear-mode softening has been investigated in the quasiharmonic anisotropic-elastic- continuum approximation, in which anharmonic effects enter through the third- and fourth-order elastic constants. A strong enhancement of the electronically driven instability by the anharmonic phonon-phonon interaction is found. © 1979 The American Physical Society.

引用

页码：3761 / 3775

页数：15

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