Specific heat of quasi-one-dimensional spin 1/2 system CuNb2O6

被引：12

作者：

Nishikawa, T ^{[1
]}

Kato, M ^{[1
]}

Kanada, M ^{[1
]}

Fukamachi, T ^{[1
]}

Kodama, K ^{[1
]}

Harashina, H ^{[1
]}

Sato, M ^{[1
]}

机构：

[1] Nagoya Univ, Dept Phys, Div Mat Sci, Nagoya, Aichi 4648602, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 06期

关键词：

CuNb2O6; spin gap; specific heat; impurity effect;

D O I：

10.1143/JPSJ.67.1988

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat C of CuNb2O6 with quasi-one-dimensional zig-zag spin S = 1/2 chains has been measured in the temperature (T) range between 1.6K and 40K. For the orthorhombic phase, a sharp anomaly of C is observed at the antiferromagnetic transition temperature T-N similar to 7.3 K. The T-dependence of C of the monoclinic phase, whose ground state has a spin gap, can he well described by the exchange parameters determined by fitting the magnetic susceptibility chi calculated for a model of a ferromagnetic-antiferromagnetic alternating bond to the experimentally obtained chi. The gap-value estimated from the low temperature behavior of C is about 21 K, which is also consistent with the ones obtained by other measurements. Results of the measurements of the magnetic susceptibilities chi and the specific heats C of M-Cu1-xZnxNb2O6 (0 less than or equal to x less than or equal to 0.5) and their structural parameters are also presented.

引用

页码：1988 / 1993

页数：6

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