PHONON ANOMALIES AND ELECTRON-LATTICE COUPLING IN INTERMEDIATE-VALENCE SM0.25Y0.75S

被引：81

作者：

BILZ, H

GUNTHERODT, G

KLEPPMANN, W

KRESS, W

机构：

[1] Max-Planck-Institut für Festkörperforschung

来源：

PHYSICAL REVIEW LETTERS | 1979年 / 43卷 / 27期

关键词：

D O I：

10.1103/PhysRevLett.43.1998

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic structure and the phonon dispersion curves of EuS, SmS, Sm0.75 Y0.25 S, and YS are analyzed. A five-parameter model is deduced which describes the phonon dispersion of Sm0.75 Y0.25 S quite well. Two nearest-neighbor Sm-S forces and three deformabilities are introduced, two of which are attributed to virtual f-d transitions with dipolar- and breathing"-type symmetry while the third is a quadrupolar-type sulfur deformability. The model suggests a strongly localized form of the microscopic theory. © 1979 The American Physical Society."

引用

页码：1998 / 2001

页数：4

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