Magnetic anisotropy and geometrical frustration in the Ising spin-chain system Sr5Rh4O12
G. Cao, S. Parkin, and P. Schlottmann

TL;DR
This study investigates the magnetic properties and frustration effects in the newly synthesized Sr5Rh4O12, revealing complex magnetic transitions and Ising behavior in a 4d/5d spin-chain system.
Contribution
It provides the first structural and thermodynamic analysis of Sr5Rh4O12, highlighting its unique frustrated Ising spin-chain behavior without 3d-electron involvement.
Findings
Antiferromagnetic order below 23 K
Two step-like magnetization transitions at 2.4 T and 4.8 T
Evidence of geometrical frustration and Ising character
Abstract
A structural and thermodynamic study of the newly synthesized single crystal Sr5Rh4O12 is reported. Sr5Rh4O12 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. Sr5Rh4O12 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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