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Anamolous, Anisotropic and Extended Nonlinear Susceptibility in a-RuCl3

ORAL

Abstract

In proximate Kitaev a-RuCl3, we establish a radically new behavior of the nonlinear susceptibility hitherto not established. For T < Tc and B || ab-plane, a dual nonlinear response is observed. The high field response above 2 T yields a third order nonlinear susceptibility which peaks near Tc = 7.5 K, reminiscent of behavior in a classical 2D antiferromagnet, but with a large positive value for lowest T. The low field response, for B less than 2T - on the other hand, is positive quadratic and shows a rapid rise below Tc. This dual response vanishes for T beyond Tc where the nonlinear response is dominated by only the cubic term. This term is significantly > 0 and turns negative only for a temperature T > 50 K >> Tc. Classical Monte Carlo (CMC) simulations capture the observed quadratic response, albeit only near Tc. The CMC however fail to reproduce the large quadratic term at low T.. This discrepancy indicates inadequacy of current models and points to the importance of multi-spin correlations in a-RuCl3. For B || c-axis, we measure no dual response with only the cubic term being apparent. We also compare our results with exact diagonalization calculations performed on 16 x 16 cluster.

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Presenters

  • Bellave Shivaram

    Univ of Virginia

Authors

  • Bellave Shivaram

    Univ of Virginia

  • Ludwig FW Holleis

    Univ of Virginia

  • Joseph Prestigiacomo

    Naval Research Laboratory, United States Naval Research Laboratory

  • Zhije Fan

    Univ of Virginia

  • Satoshi Nishimoto

    Institute for Theoretical Solid State Physics, IFW-Dresden, IFW - Dresden, IFW Dresden, Germany

  • Jiaqiang Yan

    Materials Science and Engineering, The University of Tennessee, Oak Ridge National Lab, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Lab, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Arnab Banerjee

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

  • Michael Osofsky

    Naval Research Laboratory, United States Naval Research Laboratory, Naval Research Lab

  • Jeroen Van den Brink

    Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01171 Dresden, Germany, Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany, IFW - Dresden, IFW Dresden, Germany, IFW Dresden

  • Gia-Wei Chern

    Department of Physics, University of Virginia, Univ of Virginia, Physics, University of Virginia

  • David Mandrus

    Physics, University of Tennessee, Materials Science and Engineering, The University of Tennessee, Department of Materials Science & Engineering, University of Tennessee, Knoxville, The University of Tennesse, Knoxville, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Oak Ridge National Laboratory, Department of Materials Science and Engineering, University of Tennessee Knoxville, Department of Materials Science and Engineering, University of Tennessee, University of Tennessee, Knoxville, Material Science and Technology Division, Oak Ridge National Laboratory, Material Science and Technology Division, Oak Ridge National Lab

  • Stephen E Nagler

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