Positron annihilation characteristics in GaxIn1-xAsySb1-y lattice matched to different substrates

被引：4

作者：

Bouarissa, N ^{[1
]}

机构：

[1] Univ Msila, Dept Phys, Msila 28000, Algeria

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2003年 / 103卷 / 03期

关键词：

positron annihilation; substrates; lattice matched; quaternary alloys;

D O I：

10.1016/S0921-5107(03)00215-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Positron states in the quaternary cubic system GaxIn1-xAsySb1-y lattice matched to different substrates have been studied. The electron wavefunctions are calculated using the pseudopotential method within the virtual crystal approximation which includes the effects of compositional variations, whereas the positron wavefunction was solved with the ionic potential taken in the point-core approximation. Our calculations have shown that the effect of changing the substrate is generally significant as regards the positron states and related quantities. Moreover, it is found that the enhancement of the lattice mismatch leads to a decrease of the positron annihilation rate indicating the increase of the positron bulk lifetime which is confirmed by using the Siethoff relation (Phys. Stat. Sol. (b) 205 (1998) R3). (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：219 / 226

页数：8

共 33 条

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