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Effect of quenched disorder on an equilateral triangular lattice antiferromagnet Ba<sub>3</sub>CoSb<sub>2</sub>O<sub>9</sub>

ORAL

Abstract

Ba3CoSb2O9 is one of few prototypical materials for the two-dimensional equilateral triangular lattice antiferromagnet. We present a systematic study on effect of quenched disorder on magnetic properties in the Sr doped single-crystalline sample of Ba2.8Sr0.2CoSb2O9 by means of DC and AC susceptibilities, specific heat and advanced neutron scattering. DC susceptibility in Ba2.8Sr0.2CoSb2O9 confirms an antiferromagnetic ordering below 2.8 K with an easy-plane anisotropy. AC susceptibility as a function of magnetic field measured at 0.02 K indicates a phase transition around 8 T. Evolution of the transition temperature as a function of field was determined by specific heat measurements in Ba2.8Sr0.2CoSb2O9. We will also discuss effect of side disorder on the magnetic structure in Ba2.8Sr0.2CoSb2O9 using the single-crystal neutron diffraction technique.

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Presenters

  • Qing Huang

    University of Tennessee, Department of Physics & Astronomy, University of Tennessee, University of Tennessee, Knoxville, Department of Physics, University of Tennessee, Physics, University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville

Authors

  • Qing Huang

    University of Tennessee, Department of Physics & Astronomy, University of Tennessee, University of Tennessee, Knoxville, Department of Physics, University of Tennessee, Physics, University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Haidong Zhou

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, University of Knoxville, Tennessee, Department of Physics & Astronomy, University of Tennessee, University of Tennesse, Knoxville, Physics and anstronomy, University of Tennessee, Department of Physics, University of Tennessee, Physics, University of Tennessee, Knoxville, University of Tennessee, Knoxville

  • Tao Hong

    Oak Ridge National Lab, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge National Lab, Neutron Scattering Division

  • Eun Sang Choi

    Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Field Magnet Laboratory, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab

  • Jie Ma

    Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai Jiao Tong University, Shanghai Jiao Tong Univ

  • Lu Li

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, Physics, University of Michigan, University of Michigan

  • Cole D Mauws

    Dept. of Chemistry, University of Manitoba, Chemistry, University of Manitoba, University of Manitoba

  • Christopher Wiebe

    Univ of Edinburgh, The University of Winnipeg, University of Winnipeg