Observation of high-frequency vibrational gap modes for KI:Cl- and KI:Br-

被引：4

作者：

Grant, AR

Sievers, AJ

Sangster, MJL

Strauch, D

机构：

[1] CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853

[2] UNIV READING,JJ THOMSON PHYS LAB,READING RG6 6AF,BERKS,ENGLAND

[3] UNIV REGENSBURG,INST THEORET PHYS,D-93053 REGENSBURG,GERMANY

来源：

EUROPHYSICS LETTERS | 1996年 / 34卷 / 01期

关键词：

D O I：

10.1209/epl/i1996-00416-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Strong far-IR impurity-induced gap modes are observed just below the bottom of the optic phonon band in KI: one for Cl- and the other for Br-. Both of these modes have been predicted using empirical potentials. The agreement between theory and experiment for the two Cl- modes indicates that the impurity displacement is dominant for the higher-frequency one but of little importance for the lower-frequency pocket-like gap mode.

引用

页码：63 / 68

页数：6

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