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Disorder-driven Negative Magnetoresistance and Anomalous Hall Effect in Magnetic Semimetal EuB<sub>6</sub>

ORAL

Abstract

Europium hexaboride (EuB6), a well-known ferromagnetic semimetal, is attracting renewed interest owing to the possible emergence of topologically non-trivial phases, such as the magnetic Weyl semimetal state and a quantum anomalous Hall insulator1–4. In this work, we discuss the effect of stoichiometric disorder on spin-dependent transport characteristics in EuB6 thin films. A high-throughput combinatorial approach is employed to perform systematic investigation of the B:Eu ratio. Off-stoichiometric regions above critical points show significant enhancement in negative magnetoresistance and the anomalous Hall effect. With careful structural and electrochemical analyses, these results provide clues for the disorder-induced topological phase transition in EuB6.

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Publication: [1] S. Nie et al. Magnetic Semimetals and Quantized Anomalous Hall Effect in EuB6, Phys. Rev. Lett. 124, 076403 (2020).<br>[2] S.-Y. Gao et al. Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB6, Phys. Rev. X 11, 021016 (2021).<br>[3] W. L. Liu et al. Spontaneous Ferromagnetism Induced Topological Phase Transition in EuB6, arXiv:2103.04658v1 (2021).<br>[4] J. Shen et al. Dynamic Band-Folding Induced Giant Unconventional Anomalous Hall Effect in Magnetic Weyl Semimetal EuB6, arXiv:2106.02904v1 (2021).

Presenters

  • Jihun Park

    Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA;, University of Maryland, College Park

Authors

  • Jihun Park

    Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA;, University of Maryland, College Park

  • Xiaohang Zhang

    Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA, Nova Research, University of Maryland

  • Shanta Saha

    Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA, University of Maryland, College Park

  • Kideuk Nam

    Department of Physics, Pukyong National University, Busan 48513, Republic of Korea

  • Heshan Yu

    Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA

  • Naila Al Hasan

    Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA

  • Suchismita Sarker

    Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Apurva Mehta

    Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Jong-Seong Bae

    Busan Center, Korea Basic Science Institute, Busan 46742, Republic of Korea

  • Johnpierre Paglione

    University of Maryland, College Park, Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA, Univ of Maryland-College Park

  • Richard L Greene

    University of Maryland -College Park, Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA

  • Seunghun Lee

    Department of Physics, Pukyong National University, Busan 48513, Republic of Korea

  • Ichiro Takeuchi

    University of Maryland, College Park, Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA