Ground State Tuning by Spin-Orbit Coupling and Lattice Degrees of Freedom in Single-Crystal BaIr$_{\mathrm{1-x}}$Ru$_{\mathrm{x}}$O$_{3}$ (0 $\le $ x $\le $ 1)

ORAL

Abstract

BaIrO$_{3}$ is a magnetic insulator driven by spin-orbit coupling (SOC) whereas BaRuO$_{3}$ is a paramagnetic metal. The contrasting ground states provide a unique opportunity to study the role of the SOC and the lattice degrees freedom. Our investigation reveals that substitution of Ru$^{4+}$ (4$d^{4})$ ions for Ir$^{5+}$ (5$d^{5})$ ions in BaIrO$_{3}$ reduces the magnitude of the SOC and the structural distortion. There are two major effects of Ru additions: (1) Light Ru doping (0$\le $ x $\le $ 0.15) prompts a simultaneous, precipitous drop in both the magnetic ordering temperature T$_{\mathrm{C}}$ and the electrical resistivity, which exhibits a crossover behavior from a metallic to an insulating state near T$_{\mathrm{C}}$. (2) Heavier Ru doping (0.41$\le $ x $\le $ 0.9) induces a robust metallic state with a strong spin frustration.

*This work was supported by the National Science Foundation (NSF) under Grants No. DMR-1265162; L.E.D. is supported by U.S. Department of Energy Grant No. DE-FG02-97ER45653.

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Authors

  • S.J. Yuan

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA
    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • S.J. Yuan

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA
    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • T.F. Qi

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • J. Terzic

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • S. Aswartham

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • L.E. DeLong

    • University of Kentucky
    • University of Kentucky, Department of Physics and Astronomy
    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • Gang Cao

    • University of Kentucky
    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA
    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA