Large low temperature specific heat in the negative thermal expansion compound ZrW2O8

被引：159

作者：

Ramirez, AP ^{[1
]}

Kowach, GR ^{[1
]}

机构：

[1] AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.80.4903

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat C(T) of ZrW2O8 is measured from 1 to 300 K. Below 50 K, C(T) is dominated by an Einstein term of energy (h) over bar omega(0) = 5 meV, which represents 6.5% of the total lattice degrees of freedom. This concentration of phonon spectral weight at low energies is unusual in materials of cubic structure and is a possible indication of "rigid unit modes" discussed for underconstrained crystal structures. The relationship between C(T) and the large negative thermal expansion in:this compound is discussed.

引用

页码：4903 / 4906

页数：4

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