RIGIDITY PERCOLATION AND LOW-ENERGY EXCITATIONS IN AMORPHOUS ASXSE1-X

被引：30

作者：

BRAND, O

VONLOHNEYSEN, H

机构：

[1] Physikalisches Institut der Universität Karlsruhe, Karlsruhe 1

来源：

EUROPHYSICS LETTERS | 1991年 / 16卷 / 05期

关键词：

D O I：

10.1209/0295-5075/16/5/008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on a systematic study of the low-temperature specific heat C (0.1 K less-than-or-equal-to T less-than-or-equal-to 3K) of AsxSe1-x glasses over a wide range of concentrations x. The linear contribution to C which is attributed to two-level tunnelling states (TLS) shows a pronounced dependence on the average coordination number m = x + 2 with a minimum in the vicinity of the threshold of rigidity percolation m(c) = 2.4, and a maximum near m almost-equal-to 2.7. This hints at two microscopically distinct types of TLS. The vibrational contribution to C shows a similar x dependence, suggesting a strong correlation between TLS and vibrational excitations.

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页码：455 / 460

页数：6

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