Pressure-tuning of the quantum spin Hamiltonian of a triangular lattice antiferromagnet

ORAL

Abstract

Quantum antiferromagnets on a triangular lattice are prototype materials to investigate the phenomena of geometrical frustration in quantum matter. Apart from highly unusual magnetic properties, they possess a very rich phase diagram ranging from a simple unfrustrated square lattice to a quantum spin liquid, yet to be confirmed experimentally. One major obstacle in this area of research is the lack of materials with appropriate (ideally tuned) exchange coupling parameters. Here, we demonstrate an alternative approach where, instead of the chemical composition, the spin Hamiltonian of a triangular lattice antiferromagnet is tuned by hydrostatic pressure. The combination of tunnel-diode-oscillator and electron spin resonance techniques allows us to accurately monitor the spin-Hamiltonian parameters in Cs2CuCl4, revealing a significant increase of its exchange coupling ratio from 0.3 to 0.42 at a pressure of 1.8 GPa. A number of emerging field-induced transitions were observed in the high-pressure phase.

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Presenters

  • Sergei Zvyagin

    • Dresden High Magnet Field Lab HLD, Helmholtz Zentrum Dresden Rossendorf
    • Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf
    • High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf (HZDR)

Authors

  • Sergei Zvyagin

    • Dresden High Magnet Field Lab HLD, Helmholtz Zentrum Dresden Rossendorf
    • Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf
    • High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf (HZDR)

  • David E Graf

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Lab, Tallahassee, FL
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University
    • National High Magnetic Field Lab
    • NHMFL, Tallahassee, FL, United States
    • Florida State University
    • National High Magnetic Field Laboratory, Florida State University
    • NHMFL-FSU
    • National High Magnetic Field Laboratory and Florida State University
    • NHMFL

  • Takahiro Sakurai

    • Research Facility Center for Science and Technology, Kobe University

  • Shojiro Kimura

    • Institute for Materials Research, Tohoku University

  • Hiroyuki Nojiri

    • Institute for Materials Research, Tohoku University

  • Joachim Wosnitza

    • Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf
    • Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf

  • Hitoshi Ohta

    • Molecular Photoscience Research Center, Kobe University
    • Kobe University

  • Toshio Ono

    • Department of Physical Science, Osaka Prefecture University

  • Hidekazu Tanaka

    • Tokyo Tech
    • Department of Physics, Tokyo Institute of Technology