DIMENSIONALITY CROSSOVERS IN THE MAGNETIZATION OF THE CANTED ANTIFERROMAGNETS NH4MNPO4.H2O AND ND4MNPO4.D2O

被引：11

作者：

CARLING, SG ^{[1
]}

DAY, P ^{[1
]}

VISSER, D ^{[1
]}

机构：

[1] LOUGHBOROUGH UNIV TECHNOL, DEPT PHYS, LOUGHBOROUGH LE11 3TU, LEICS, ENGLAND

来源：

SOLID STATE COMMUNICATIONS | 1993年 / 88卷 / 02期

关键词：

D O I：

10.1016/0038-1098(93)90394-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Critical exponents of the magnetization below TN measured by SQUID magnetometry and neutron diffraction are reported for the two-dimensional canted antiferromagnets NH4MnPO4.H2O and ND4MnPO4.D2O. Both compounds exhibit a crossover in the power law dependence of magnetization on temperature. In the former we find beta1 0.21(3), beta2 0.40(7), T(N) 17.5(1) K; in the latter beta1 0.20(1), beta2 0.39(4), T(N) 17.5(3) K. The crossover between the two exponents occurs at a reduced temperature of 0.07(1) in the hydrogenated compound and 0.030(5) in the deuterated one. The values of beta1 are compared with those predicted by two dimensional (2D) models of exchange and the change from beta1 to beta2 is attributed to a crossover in lattice dimensionality from 2d-3d.

引用

页码：135 / 138

页数：4

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