Spin-1/2 Triangular Lattice in Ag2NiO2

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Description

A novel metallic compound with a spin‐1/2 triangular lattice is reported. It is a silveroxonickelate Ag2NiO2 containing a NiO2 layer which possesses a spin‐1/2 triangular lattice with twofold spin and twofold orbital degeneracy. It is found that a structural transition takes place at Ts = 260 K, which may be related to orbital ordering, and long‐range antiferromagnetic order sets in below TN = 54 K.

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