SEMI-CONDUCTOR-TO-METAL TRANSITION AND POSITRON ANNIHILATION IN V2O3

被引：11
|
作者：
GAINOTTI, A
GHEZZI, C
MANFREDI, M
机构：
[1] Istituto di Fisica dell'Università, Parma
来源：
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-BASIC TOPICS IN PHYSICS | 1969年 / 62卷 / 01期
关键词：
D O I：
10.1007/BF02712471
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Positron lifetime spectra in V2O3 have been recorded in the temperature range (80÷300) °K in which the transition to the metal state occurs. The occurrence of a complex positron time annihilation spectrum is ascribed to annihilations taking place in different positron band states. The positron lifetimes τ 1=1.94·10-10s and τ 2=4.74·10-10 s are found to be constant in the explored temperature range. This is explained in terms of localization of positron and electron wave functions. The observed behaviour with temperature of the intensities of the decay components is discussed as being due to the screening effect of the conduction electrons on the repulsive action of the V3+ lattice ions. © 1969 Società Italiana di Fisica.
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页码：121 / +
页数：1
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