Abstract
A structural and thermodynamic study of the newly synthesized single crystal Sr 5Rh 4O 12 is reported. Sr 5Rh 4O 12 consists of a triangular lattice of spin chains running along the c -axis. It is antiferromagnetically ordered below 23 K with the intrachain and interchain coupling being ferromagnetic (FM) and antiferromagnetic (AFM), respectively. There is strong evidence for an Ising character in the interaction and geometrical frustration that causes incomplete long-range AFM order. The isothermal magnetization exhibits two step-like transitions leading to a ferrimagnetic state at 2.4 T and a FM state at 4.8 T, respectively. Sr 5Rh 4O 12 is a unique frustrated spin-chain system ever found in 4d and 5d based materials without a presence of an incomplete 3d-electron shell.
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