Spin dynamics in IrSr2Sm1.15Ce0.85Cu2O10: Complex magnetic behavior in a layered iridocuprate

被引：2

作者：

Colman, R. H. ^{[1
]}

Manuel, P. ^{[2
]}

Khalyavin, D. D. ^{[2
]}

Hillier, A. D. ^{[2
]}

Mclaughlin, A. C. ^{[1
]}

机构：

[1] Univ Aberdeen, Dept Chem, Aberdeen AB24 3UE, Scotland

[2] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QA, Oxon, England

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

SUPERCONDUCTIVITY; GLASS; MAGNETORESISTANCES; NEUTRON; SYSTEM; FAMILY; LA;

D O I：

10.1103/PhysRevB.88.184408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A muon spin rotation (mu SR), neutron, and synchrotron diffraction study of the reentrant spin-glass material IrSr2Sm1.15Ce0.85Cu2O10 is presented. The synthesis has been optimized, and Rietveld refinement of the diffraction patterns shows no sign of the previously reported Ir/Cu cation exchange but confirms the structure along with the disordered tilts and rotations of IrO6 octahedra. The zero-field-mu SR response indicates a complex temperature dependence to the magnetism with multiple transitions that are confirmed to be bulk phenomena. Consecutive transitions are reported at t(1) = 140, t(2) = 20, and t(3) = 6 K. The broad transition at 140 K is assigned to antiferromagnetic ordering of Ir4+ spins with a stripe spin structure. The low-temperature transitions are a result of antiferromagnetic ordering of Cu2+ spins followed by the freezing of a disordered Ir spin component, further evidenced by a strong damping of the oscillation amplitude below 6 K. These observations confirm the bulk nature of the previously reported reentrant spin-glass behavior of this complex magnetic system.

引用

页数：7

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