Dynamics of the antiferromagnetic random-exchange Ising system FexZn1-xF2 near the percolation threshold

被引：14

作者：

Jonason, K ^{[1
]}

Djurberg, C ^{[1
]}

Nordblad, P ^{[1
]}

Belanger, DP ^{[1
]}

机构：

[1] UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 09期

关键词：

SPIN-GLASS; PHASE; FIELD; RELAXATION;

D O I：

10.1103/PhysRevB.56.5404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dynamic magnetic properties of the diluted Ising antiferromagnet, Fe0.25Zn0.75F2 have been investigated by dc-magnetic relaxation and ac-susceptibility measurements. In similarity with spill glasses a strongly frequency-dependent cusp in the dynamic susceptibility appears at low temperature. The corresponding slowing down of the relaxation times is however found to follow an Arrhenius law, i.e., critical dynamics indicating a phase transition is not observed. Also. there are no indications of an equilibrium Almeida-Thouless line in the H-T plane and the field dependence of the equilibrium susceptibility behaves noncritically. However, an ageing behavior, a common feature of frustrated disordered magnetic systems. is observed at low temperatures.

引用

页码：5404 / 5411

页数：8

共 22 条

[1] THE RANDOM FIELD ISING-MODEL [J].