OSCILLATORY COUPLING BETWEEN INTERFACES IN METALLIC MULTILAYERS

被引:22
作者
BRUNO, E [1 ]
GYORFFY, BL [1 ]
机构
[1] UNIV MESSINA,DIPARTIMENTO FIS,I-98106 MESSINA,ITALY
关键词
D O I
10.1088/0953-8984/5/14/010
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We have developed a theory that views the total energy of an array of multilayers as a weighted average of bulk contributions corrected by a sum of single-interface and interface-interface interactions terms. We show that for metallic systems these interactions oscillate as functions of the appropriate interface-interface separations. Furthermore, we demonstrate that they are due to the same quantum-mechanical property of a degenerate Fermi liquid in a localized external potential as that which gives rise to the Friedel charge and magnetic oscillation around an impurity and the corresponding Ruderman-Kittel-Kasuya-Yoshida (RKKY) interactions. We argue that the recently discovered oscillatory magnetic coupling between magnetic layers separated by paramagnetic metallic layers should be accompanied by elastic interactions that give rise to periodic strain modulations, DELTAa/a, in the spacer layers. We illustrate the foregoing discussion by explicit calculation on an inhomogeneous jellium model.
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页码:2109 / 2136
页数:28
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