TRAVELING PSEUDOFERMION APPROXIMATION FOR PHONON FREQUENCY-SPECTRA OF BINARY MIXED-CRYSTALS

被引：11

作者：

DIEHL, HW ^{[1
]}

LEATH, PL ^{[1
]}

KAPLAN, T ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830

来源：

PHYSICAL REVIEW B | 1979年 / 19卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.19.5044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The traveling, one pseudofermion approximation (TPA) for binary mixed crystals with mass and force-constant disorder is presented. This approximation is, for off-diagonal disorder, analogous to the average t-matrix approximation for diagonal disorder. Numerical results are presented for various cases of disorder in harmonic linear chains. It is shown that the resulting TPA phonon spectrum lies within the bounds of the exact spectrum. © 1979 The American Physical Society.

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页码：5044 / 5048

页数：5

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