Widely spaced planes of magnetic dimers in the Ba6 Y2Rh2Ti2 O17-δ hexagonal perovskite

Loi T. Nguyen, Daniel B. Straus, Q. Zhang, R. J. Cava

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We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material, to the best of our knowledge, 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=2T, is observed. A large T-linear term in the specific heat (γ=166mJ/molf.uK2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.

Original languageEnglish (US)
Article number034419
JournalPhysical Review Materials
Issue number3
StatePublished - Mar 2021

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physics and Astronomy (miscellaneous)


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