Magnetic short-range correlations and Kosterlitz-Thouless transitions in TmMgGaO4

ORAL

Abstract

Transverse Ising model on a triangular lattice is known to host two Kosterlitz-Thouless (KT) transitions at low temperatures. Triangular lattice antiferromagnet TmMgGaO4 is a promising candidate to realize such physics due to the interplay between geometric frustration, spin orbit coupling, and crystal electric fields. In TmMgGaO4 short-range magnetic correlations are observed over a broad temperature range. However, the nature of this short-range magnetic order is under debate. Recent numerical work has predicted a Kosterlitz-Thouless transition at 4 K, which however lacks any experimental evidence thus far. Using AC susceptibility and neutron scattering measurements, we unveil this transition and discuss its implications in understanding the rich physics of TmMgGaO4.

*The work at Georgia Tech was sponsored by the National Science Foundation under NSF-DMR-1750186

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Presenters

  • Marcus Daum

    • School of Physics, Georgia Institute of Technology
    • Georgia Inst of Tech

Authors

  • Marcus Daum

    • School of Physics, Georgia Institute of Technology
    • Georgia Inst of Tech

  • Zhiling Dun

    • Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • Physics, Georgia Institute of Technology
    • Georgia Institute of Technology

  • 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

  • Martin Mourigal

    • Georgia Inst of Tech
    • School of Physics, Georgia Institute of Technology
    • Physics, Georgia Institute of Technology
    • Georgia Institute of Technology