PHONONS IN MIXED-VALENCE SYSTEMS

被引：29

作者：

BENNEMANN, KH ^{[1
]}

AVIGNON, M ^{[1
]}

机构：

[1] CNRS,TRANSIT PHASES GRP,F-38042 GRENOBLE,FRANCE

来源：

SOLID STATE COMMUNICATIONS | 1979年 / 31卷 / 09期

关键词：

D O I：

10.1016/0038-1098(79)90315-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The effect of valence changes due to f{hook}←d electronic transitions on phonons is studied. A large electronic density of states at the Fermi-energy in the intermediate valence state causes significant softening of the longitudinal acoustic and optic phonons and large phonon line-widths. These phonon renormalizations due to strong electron-lattice coupling are largest for phonon wavevectors q along the (111)-direction and maximal at the zone-boundary for LO modes and nearly half-way towards the zone-boundary in the case of LA mode. The results agree well with recent neutron scattering data on Sm0.75Y0.25S. © 1979.

引用

页码：645 / 648

页数：4

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