Anomalous dispersion of LO phonon branches in Ba0.6K0.4BiO3

被引：36

作者：

Braden, M

Reichardt, W

Ivanov, AS

Rumiantsev, AY

机构：

[1] CENS,CEA,CNRS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE

[2] IV KURCHATOV ATOM ENERGY INST,RUSSIAN RES CTR,MOSCOW 123182,RUSSIA

来源：

EUROPHYSICS LETTERS | 1996年 / 34卷 / 07期

关键词：

D O I：

10.1209/epl/i1996-00490-0

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The high-frequency oxygen vibrations in superconducting Ba0.6K0.4BiO3 have been studied by inelastic neutron scattering. The results give evidence that the Coulomb forces between the ions are screened only imperfectly. The highest LO branches associated with the Bi-O bond stretching vibrations exhibit an anomalous shape with a particularly pronounced frequency renormalization of the one-dimensional breathing mode. The dispersion resembles that of corresponding branches in the cuprate superconductors.

引用

页码：531 / 536

页数：6

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