Dramatic enhancement of the skyrmion phase-space of Cu<sub>2</sub>OSeO<sub>3</sub> driven by high pressure

ORAL

Abstract

Generally, the skyrmion phase in a bulk helimagnet occurs only over a very restricted magnetic-field – temperature phase space and often at low temperatures. We have expanded and enhanced the skyrmion phase region from the small range of (55-58.5 K) to (5-300 K) in single crystal Cu2OSeO3 by pressures up to 42.1 GPa through a series of phase transitions from the cubic P213, through orthorhombic P212121 and monoclinic P21, and finally to the triclinic P1 phase, using our newly developed ultrasensitive high pressure magnetization technique. The results are in agreement with our Ginzburg - Landau free energy analyses that pressure tends to stabilize the skyrmion states and at higher temperatures. These observations also show that the skyrmion state can be achieved at higher temperatures in various crystal symmetries, suggesting the insensitivity of skyrmions to the underlying crystal lattices and thus the possibility of finding more ubiquitous presence of skyrmions in helimagnets.

*The work performed at the Texas Center for Superconductivity at the University of Houston is supported by US Air Force Office of Scientific Research Grant FA9550-15-1-0236, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through TcSUH.

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Presenters

  • Liangzi Deng

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas, 77204, USA
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

Authors

  • Liangzi Deng

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity, University of Houston, Texas, 77204, USA
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Hung-Cheng Wu

    • Physics, National Sun Yat-sen University
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Alexander Litvinchuk

    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Noah Yuan

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Jey-Jau Lee

    • National Synchrotron Radiation Research Center, Taiwan

  • Rabin Dahal

    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Liang Fu

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Department of Physics, Massachusetts Institute of Technology MIT
    • Physics, MIT
    • Physics, Massachusetts Institute of Technology
    • MIT

  • helmuth berger

    • EPFL
    • Ecole Polytechnique Federale de Lausanne
    • Inst Condensed Matter & Complex Syst, Ecole Polytech Fed Lausanne, Lausanne CH-1015, Switzerland
    • Institut de Physique de la Matiere Complexe, Ecole Polytechnique Federale de Lausanne
    • Institute of Physics of Complex Matter, Switzerland

  • Hung-Duen Yang

    • Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
    • Department of Physics, National Sun Yat-sen University
    • Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
    • Natl Sun Yat Sen Univ
    • Department of Physics, National Sun Yat-sen University, Taiwan

  • Zheng Wu

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Melissa Gooch

    • Texas Center for Superconductivity and Physics Department at the Univ of Houston

  • Paul C. W. Chu

    • Texas Center for Superconductivity, Univ of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity and Physics Department at the Univ of Houston