IMPURITY MODES DUE TO INTERSTITIALS IN CAF2

被引:23
作者
HARIDASAN, TM
GOVINDARAJAN, J
NERENBERG, MA
JACOBS, PWM
机构
[1] UNIV WESTERN ONTARIO,DEPT PHYS,LONDON N6A 3K7,ONTARIO,CANADA
[2] UNIV WESTERN ONTARIO,CTR INTERDISCIPLINARY STUDIES CHEM PHYS,LONDON N6A 3K7,ONTARIO,CANADA
[3] UNIV WESTERN ONTARIO,DEPT APPL MATH,LONDON N6A 3K7,ONTARIO,CANADA
[4] UNIV WESTERN ONTARIO,CTR COMP,LONDON N6A 3K7,ONTARIO,CANADA
[5] UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 3K7,ONTARIO,CANADA
来源
PHYSICAL REVIEW B | 1979年 / 20卷 / 08期
关键词
D O I
10.1103/PhysRevB.20.3462
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A Green-function formulation for the impurity modes due to interstitials in CaF2 is given. Two methods, one due to Brice and the other due to Maradudin et al., are used. The interstitials discussed are the F- ion, the H- ion, and atomic hydrogen in CaF2. Symmetry coordinates are worked out to block diagonalize the Green-function matrix g and the perturbation matrix l. Shell-model data fitted to the experimental phonon dispersion curves are employed to compute the necessary lattice Green functions. The force-constant changes are determined by studying the relaxations of the first and second neighbors of the interstitial. Good agreement between the calculated and experimental values of the localized modes due to H- and atomic H interstitials is obtained. Resonant modes and their widths are computed for all the cases and the possibility of their experimental detection is discussed. The results of the alternate methods are compared. © 1979 The American Physical Society.
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收藏
页码:3462 / 3473
页数:12
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