Quantum-critical phase transition in the novel chiral chain compound [Cu(pym)(H2O)4]SiF6 . H2O observed in magnetic fields of up to 73 T

ORAL

Abstract

The four inequivalent Cu ions in the novel chiral chain compound [Cu(pym)(H2O)4]SiF6 . H2O experience a staggered local environment with an extra twist: a four-fold chiral structure. The consequent hierarchy of competing interactions leads to unconventional magnetic-field-dependent behavior. In this study we report measurements of the magnetization and magnetocaloric effect of single crystals of [Cu(pym)(H2O)4]SiF6 H2O in magnetic fields of up to 73 T and at temperatures down to 0.5 K. Field orientations parallel and perpendicular to the chains were used. The data reveal several unusual features, including a field-induced quantum-critical phase transition close to saturation magnetization that is absent in more conventional Sine-Gordon chains.

* NHMFL is supported by NSF Cooperative Agreement Nos. DMR-2128556 and DMR-1644779, the DOE and the State of Florida. Work at EWU is funded by National Science Foundation (NSF) grant No. DMR-1703003. J.S. acknowledges support from the Strongly Correlated Magnets thrust of the DoE BES ”Science in 100T” program and a visiting professorship at Oxford University. Warwick University acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 681260).

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Publication: J. Singleton, PA. Goddard, J.M. Blawat et al., preprint.

Presenters

  • John Singleton

    NHMFL/ LANL, NHMFL, Los Alamos National Laboratory, Los Alamos National Laboratory

Authors

  • John Singleton

    NHMFL/ LANL, NHMFL, Los Alamos National Laboratory, Los Alamos National Laboratory

  • Paul A Goddard

    University of Warwick

  • Joanna Blawat

    NHMFL, Los Alamos National Laboratory, Los Alamos National Laboratory

  • Sam Curley

    Warwick University

  • Robert Williams

    Warwick University

  • Akira Matsuo

    ISSP

  • Yoshimitsu Kohama

    The Institute for Solid State Physics, The University of Tokyo, University of Tokyo, ISSP, Institute for Solid State Physics, University of Tokyo

  • Kyla Duggan

    Eastern Washington University

  • Madison Greer

    Eastern Washington University

  • Jackie Villa

    Eastern Washington University

  • Zachary E Manson

    Eastern Washington University

  • Jamie L Manson

    Eastern Washington University