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.

*NSF-1350002
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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