Widely Spaced Planes of Magnetic Dimers in the Ba6Y2Rh2Ti2O17-δ Hexagonal Perovskite

Abstract

We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material with a hexagonal symmetry structure. Face-sharing RhO6 octahedra form triangular planes of Rh2O9 dimers that are widely separated in the perpendicular direction. The material displays a small effective magnetic moment, due to the Rh ions present, and a negative Curie-Weiss temperature. The charge transport and optical band gaps are very similar, near 0.16 eV. A large upturn in the heat capacity at temperatures below 1 K, suppressed by applied magnetic fields larger than {μ0H = 2 Tesla, is observed. A large T-linear term in the specific heat (γ=166 mJ/mol f.u-K2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.

arXiv comment5 figures, 2 tables

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Cited by in corpus (3)

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• Scaling and data collapse of two-dimensional random singlet state in magnetic field
• Witnessing Disorder in Quantum Magnets