SPIN CANTING AND EXCHANGE IN THE TWO-DIMENSIONAL ANTI-FERROMAGNETS (C3H7NH3)2MNCL4 AND (C3H7NH3)2MNBR4

被引：62

作者：

GROENENDIJK, HA ^{[1
]}

VANDUYNEVELDT, AJ ^{[1
]}

WILLETT, RD ^{[1
]}

机构：

[1] WASHINGTON STATE UNIV,DEPT CHEM,PULLMAN,WA 99164

来源：

PHYSICA B & C | 1979年 / 98卷 / 1-2期

关键词：

D O I：

10.1016/0378-4363(79)90071-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The compounds (C3H7NH3)2MnCl4 and (C3H7NH3)2MnBr4 are good approximations of the two-dimensional quadratic Heisenberg antiferromagnet. From measurements of the magnetic susceptibility the exchange constants at 80 K have been obtained, J/k = -4.45(5) K and -4.50(5) K, respectively. These exchange constants are compared with theoretical results for the MnXMn superexchange path. A slight temperature dependence of J is observed, resulting in values which are about 5% lower at 300 K. The chloride is found to show weak ferromagnetism below Tc = 39.2(2) K, which is ascribed to an antisymmetric exchange term. The canting angle of the spins is only 0.05°. The bromide compound orders at 47(3) K but shows no sign of weak ferromagnetism. © 1979.

引用

页码：53 / 59

页数：7

共 21 条

[1] PARAMAGNETIC RESONANCE-II [J].