Magnetic properties of triangular lattice Ca$_4$IrO$_6$ and Ca$_{2.5}$Sr$_{1.5}$IrO$_6$

ORAL

Abstract

We report a structural, thermodynamic, and transport study of single-crystal Ca$_4$IrO$_6$ and Ca$_{2.5}$Sr$_{1.5}$IrO$_6$. The isostructural Ca$_4$IrO$_6$ and Ca$_{2.5}$Sr$_{1.5}$IrO$_6$ feature a triangular lattice of spin chains running along the \emph{c} axis. The underlying properties of the two systems are characterized by a partial antiferromagnetic order occuring at 12 K and 9 K for Ca$_4$IrO$_6$ and Ca$_{2.5}$Sr$_{1.5}$IrO$_6$, respectively, a small entropy removal associated with the phase transition, and a sizable low-temperature specific heat linearly proportional to temperature. The detailed results will be discussed along with comparisons drawn with other related systems such as Ca$_5$Ir$_3$O$_{12}$.

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Authors

  • K.H. Butrouna

    Center for Advanced Materials, University of Kentucky

  • L. Li

    Center for Advanced Materials, University of Kentucky, Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky

  • T.F. Qi

    Center for Advanced Materials, University of Kentucky, Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky

  • O.B. Korneta

    Center for Advanced Materials, University of Kentucky, Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky

  • J. Terzic

    Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Center for Advanced Materials, University of Kentucky

  • E. Akbari

    Center for Advanced Materials, University of Kentucky

  • S. Parkin

    Center for Advanced Materials, University of Kentucky, Center for Advanced Materials, Department of Chemistry, University of Kentucky

  • S.J. Yuan

    Department of Physics, Shanghai University

  • Gang Cao

    Center for Advanced Materials, University of Kentucky, Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Center for Advanced Materials and Department of Physics and Astronomy, University of Kentucky