Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnet TmB4

ORAL

Abstract

We study TmB$_4$, a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB$_4$ is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at low-temperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We suggest that both hysteretic MR and AHE arise from the formation of complex non-coplanar structures at magnetic domain walls.

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Authors

  • Sai Swaroop Sunku

    Div of Physics and Applied Physics, Nanyang Technological University

  • Tai Kong

    Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames Laboratory/Iowa State University, Ames Laboratory and Dept of Physics and Astronomy, Iowa State University

  • Toshimitsu Ito

    National Institute of Advanced Industrial Science and Technology (AIST)

  • Paul C. Canfield

    The Ames Laboratory and Iowa State University, Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames Lab., Dept. of Physics and Astronomy, Iowa State Univ., Iowa State University/ Ames Laboratory, Ames Laboratory, Dept. of Phys. and Astro, Iowa State Univ., Ames Laboratory and Dept of Physics and Astronomy, Iowa State University

  • B. Sriram Shastry

    Univ of California-Santa Cruz, Physics Dept, University of California, Santa Cruz

  • Pinaki Sengupta

    Div of Physics and Applied Physics, Nanyang Technological University

  • Christos Panagopoulos

    Nanyang Technological University, Div of Physics and Applied Physics, Nanyang Technological University