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Spin dynamics in IrSr_{2}Sm_{1.15}Ce_{0.85}Cu_{2}O_{10}: Complex magnetic behavior in a layered iridocuprate

DOI: 10.1103/PhysRevB.88.184408 DOI Help

Authors: R. H. Colman (Department of Chemistry, University of Aberdeen) , Pascal Manuel (ISIS) , Dmitry Khalyavin (ISIS Pulsed Neutron and Muon Source) , Adrian Hillier (ISIS) , Abbie Mclaughlin (University of Aberdeen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 88 (18) , PAGES 8606-8615

State: Published (Approved)
Published: November 2013
Diamond Proposal Number(s): 7075

Abstract: A muon spin rotation ( μ SR), neutron, and synchrotron diffraction study of the reentrant spin-glass material IrSr 2 Sm 1 . 15 Ce 0 . 85 Cu 2 O 10 ispresented.Thesynthesishasbeenoptimized,andRietveldrefinementofthediffraction patterns shows no sign of the previously reported Ir/Cu cation exchange but confirms the structure along with the disordered tilts and rotations of IrO 6 octahedra. The zero-field- μ 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 Ir 4 + spins with a stripe spin structure. The low-temperature transitions are a result of antiferromagnetic ordering of Cu 2 + 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.

Subject Areas: Physics

Instruments: I11-High Resolution Powder Diffraction

Added On: 07/11/2014 11:06

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