MAGNETIC PHASE-DIAGRAM OF BCC HE-3

被引:18
作者
FUKUYAMA, H
FUKUDA, T
OKAMOTO, T
AKIMOTO, H
ISHIMOTO, H
OGAWA, S
机构
[1] Institute for Solid State Physics, University of Tokyo, Tokyo, 106, Roppongi
来源
PHYSICA B | 1991年 / 169卷 / 1-4期
关键词
D O I
10.1016/0921-4526(91)90229-8
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A complete magnetic phase diagram of bcc solid He-3 at a molar volume of 22.7 cm3/mol has been determined by pressure measurements at temperatures down to 250-mu-K in magnetic fields up to 7 T. The transition temperature between the paramagnetic phase and the high-field antiferromagnetic ordered phase increases with field and reaches a maximum (= 0.96 mK) at 3 T. Above this field, it turns to decrease and seems to be zero at 5.4 T, i.e., the upper critical field B(c2)(0). The transition is not the first-order one from 1 T to B(c2)(0). The observed reentrant phase diagram strongly supports the multiple spin exchange model, but reveals a severe quantitative inaccuracy of the mean field approximation even at high fields near B(c2)(0).
引用
收藏
页码:197 / 203
页数:7
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