Thermal transport anomaly associated with weak ferromagnetism in CaMnO3

被引：4

作者：

Fujishiro, H ^{[1
]}

Ohshiden, S ^{[1
]}

Ikebe, M ^{[1
]}

机构：

[1] Iwate Univ, Fac Engn, Morioka, Iwate 0208551, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 07期

关键词：

CaMnO3; thermal conductivity; thermal diffusivity; weak ferromagnetism; magnetic heat transport;

D O I：

10.1143/JPSJ.69.2082

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The thermal conductivity kappa(T), thermal diffusivity alpha(T) and magnetization M(T) have been measured for sintered CaMnO3 and La1-xCaxMnO3 in lightly electron-doped region (0.98 less than or equal to x less than or equal to 1.0). kappa(T) and alpha(T) of CaMnO3 show an anomalous enhancement belvw the weak ferromagnetic transition temperature T-N. The enhancement is rapidly reduced by introduction of a small amount of Mn3+ ions in La1-xCaxMnO3. The analyses suggest the possibility that the enhancement comes from the contribution of the heat transport by magnetic excitations.

引用

页码：2082 / 2086

页数：5

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