HoBi: The Effect of Magnetism on Extreme Magnetoresistance

ORAL

Abstract


Since the discovery of extreme magnetoresistance (XMR) in the topological semimetal WTe2, this phenomenon, featuring extremely high and non-saturating MR, has been found in many topological materials. In some cases, it is shown that XMR does not necessarily connect to topology and can be explained by electron-hole compensation unambiguously [1]. Although we have better understood the role of topology in XMR, the effect of magnetism on XMR remains elusive. Previous studies showed the power-law field dependence of XMR holds in both non-magnetic and magnetic XMR materials and is robust against magnetism. In this work [2], we focus on HoBi in the rare-earth monopnictide material family, which has an antiferromagnetic ground state with huge moments. We find an exact correspondence between the phase diagrams mapped by magnetization and transport measurements. Interestingly, we also find the XMR of HoBi is significantly affected by its magnetic order with ordering vector (1/6,1/6,1/6), in strong contrast to its family members like CeSb. The interplay between magnetism and transport makes HoBi a great platform to understand XMR in magnetic semimetals with trivial or non-trivial topology.
References:
[1] Physical Review B 96, 235128 (2017)
[2] Physical Review B 98, 045136 (2018)

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Presenters

  • Hung-Yu Yang

    Department of Physics, Boston College

Authors

  • Hung-Yu Yang

    Department of Physics, Boston College

  • Jonathan Gaudet

    Department of Physics and Astronomy, McMaster University, Johns Hopkins University, Baltimore, MD 21218, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics and Astronomy, Johns Hopkins University, IQM, Johns Hopkins University

  • Adam Aczel

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, Oak Ridge National Laboratory, Oak Ridge Nat. Lab.

  • 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

  • Peter Blaha

    Institute of Materials Chemistry, Vienna University of Technology

  • Bruce Gaulin

    Department of Physics and Astronomy, McMaster University, McMaster University, Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1, Physics and Astronomy, McMaster University

  • Fazel Fallah Tafti

    Department of Physics, Boston College, Physics, Boston College, Dept. of Physics, Boston College, Boston College