Thickness dependent quantum oscillations in ferromagnetic Weyl metal SrRuO<sub>3</sub>

ORAL

Abstract

In a Weyl semimetal, a unique Weyl-orbit quantum oscillations can appear resulting from a nonlocal cyclotron orbit that connects the top and bottom Fermi-arc surface states via the bulk Weyl nodes. In this talk, such a Weyl-orbit effect (WOE) will be demonstrated in untwinned thin films of ferromagnetic Weyl metal SrRuO3 (SRO). From thickness dependent measurements of the quantum oscillations with field strength up to 35 T, we uncovered an unusual small Fermi pocket with a light effective mass and an oscillation frequency of about 30 T, which behaves as a 2D-like Fermi-pocket and shows a maximum oscillation amplitude for film thickness in a range of 10 – 20 nm. In addition, unusual thickness dependent phase shift and also concave downward curvature in the Landau fan diagram were observed, which agrees well with the simulated curves based on WOE theory with nonadiabatic correction terms. Discussions between the simulations and experimental data will be provided to address the issue regarding the optimum film thickness for achieving dominant WOE contribution in Weyl metal SRO.

*This work was supported from Academia Sinica (Thematic Research Program),National Science and Technology Council of Taiwan (NSTC Grant No. 108-2628-M-001 -007 -MY3 and 106-2112-M-213-006-MY3) and HFML-RU/NWO-I, a member of the European Magnetic Field Laboratory (EMFL).

–

Publication: Kar et al. arXiv:2112.13331

Presenters

  • Wei-Li Lee

    • Inst of Physics Academia Sinica

Authors

  • Wei-Li Lee

    • Inst of Physics Academia Sinica

  • Wei-Cheng Lee

    • Binghamton University

  • Steffen Wiedmann

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

  • Akhilesh K Singh

    • Institute of Physics, Academia Sinica
    • Inst of Physics Academia Sinica
    • Academia Sinica

  • Uddipta Kar

    • Academia SinicaInstitute of Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Nankang, 11529, Taipei, Taiwan

  • Yu-Te Hsu

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

  • Steffen Wiedmann

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

  • Maarten Berben

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

  • Chih-Yu Lin

    • Institute of Physics, Academia Sinica
    • Inst of Physics Academia Sinica

  • Bipul Das

    • Institute of Physics, Academia Sinica
    • Inst of Physics Academia Sinica

  • Cheng-Tung Cheng

    • Institute of Physics, Academia Sinica
    • Inst of Physics Academia Sinica

  • Chia-Hung Hsu

    • National Synchrotron Radiation Research Center
    • Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan

  • Song Yang

    • National Synchrotron Radiation Research Center
    • Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan

  • Chun-Yen Lin

    • Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan