期刊
PHYSICAL REVIEW B
卷 62, 期 10, 页码 6521-6529出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.6521
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Polycrystalline Li4MgReO6 was prepared by means of solid-state synthesis. The crystallographic structure was determined from high-resolution powder-neutron-diffraction data. It was found that Li4MgReO6 crystallizes in space group C2/m with lattice parameters, a=5.0978(3) Angstrom, b=8.8163(5) Angstrom, c=5.0815(3) Angstrom, and beta=109.835(2)degrees. This structure is an ordered variant of Li2SnO3 in which Li+, Mg2+, and Re6+ ions occupy the Sn4+ sites, which can be desribed as honeycomb layers. Due to the large differences in formal charge, the Re6+ ions order on half of the Sn sites forming a distorted face-shared tetrahedral sublattice. As Re6+ is an S=1/2 ion this material is an attractive candidate for the study of the effects of geometric frustration on a quantum spin system. The investigation of bulk magnetic susceptibilities acid magnetization studies as well as low-temperature neutron-diffraction experiments reveals a spin-glass behavior with a glass transition temperature of 12 K. Both heat-capacity and muon spin-relaxation measurements at low temperatures are consistent with a spin-glass interpretation with no long-range order detectable down to T=0.5 K.
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