Inelastic Neutron Scattering of the Spin-liquid Candidate Ba<sub>3</sub>ZnRu<sub>2</sub>O<sub>9</sub> and diluted Ba<sub>3</sub>Zn(Ru<sub>0.1</sub>Sb<sub>0.9</sub>)<sub>2</sub>O<sub>9</sub>

ORAL

Abstract

Ba3ZnRu2O9 (BZRO) is a 6-H perovskite compound that contains triangular lattice layers of S=3/2 Ru5+ dimers, and was reported to have no signatures of long-range-magnetic-order down to 37 mK and therefore put forward as a spin-liquid candidate.[1] We present inelastic neutron scattering measurments on BZRO powder, an array of BZRO crystals, and a diluted powder of Ba3Zn(Ru0.1Sb0.9)2O9. The method of studying dilute and non-dilute materials in concert, along with support of density functional theory calculations, helps ameliorate the problem of many parameters in the magnetic Hamiltonian. So, while historical considerations of an analogous compound Ba3CaRu2O9 have suggested these materials to be magnetic dimers with perturbative inter-dimer interactions,[2] our findings show BZRO to be away from the dimer regime with a strikingly small (vanishing?) gap in the magnetic correlations and a bandwidth of the similar magnitude as the intra-dimer interaction.

[1] I. Terasaki, and co-authors, J. Phys. Soc. Jpn. 86, 033702 (2017) [4 Pages]

[2] J. Darriet, and co-authors, J. Phys. Chem. Solids 44 (1983) pp. 269-212.

*This research used resources at the Spallation Neutron Source and High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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Presenters

  • Daniel M Pajerowski

    • Oak Ridge National Lab

Authors

  • Daniel M Pajerowski

    • Oak Ridge National Lab

  • Daniel Phelan

    • Argonne National Laboratory

  • Yu Li

    • Argonne National Laboratory

  • Matthew B Stone

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Yongqiang Cheng

    • Oak Ridge National Laboratory

  • Alexander I Kolesnikov

    • Oak Ridge National Lab

  • Duminda D Sanjeew

    • University of Missouri