The interplay of non-trivial band topology and magnetism in Half-Heusler alloys (Tb/Dy)PtBi

ORAL

Abstract

Half-Heusler compound GdPtBi is one of the few time reversal symmetry breaking Weyl semimetals induced by magnetic field and is characterized by the chiral anomaly and the anomalous Hall effect with an exceptionally large Hall angle θH (≈0.2)[1-3]. In order to understand how the Weyl bands interplay with magnetism in Half-Heusler alloys, we have studied magnetotransport properties of (Tb/Dy)PtBi. We observed anomalous Hall effects in both materials and find their Hall angles as well as magnetoresistance sensitively depend on their magnetic states. In TbPtBi, its θH is found to be 0.4, twice that of GdPtBi and its magnetoresistance shows signatures of chiral anomaly. However, for DyPtBi, although Dy carries magnetic moment greater than those of Gd and Tb, it does not show chiral anomaly and its θH is much smaller. There discrepancies can be attributed to the different magnetic states of these two materials. These findings suggest that the non-trivial band topology under magnetic field of half-Heusler alloys is intimately associated the magnetism generated by rare earth element.

[1] T. Suzuki et al., Nat. Phys. (2016).
[2] M. Hirschberger et al., Nat. Mater. 15, 1161 (2016).
[3] C. Shekhar et al., ArXiv Prepr. ArXiv160401641 (2016).

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Presenters

  • Yanglin Zhu

    Tulane University, Physics and Engineering physics department, Tulane Univ, Department of Physics and Engineering Physics, Tulane University

Authors

  • Yanglin Zhu

    Tulane University, Physics and Engineering physics department, Tulane Univ, Department of Physics and Engineering Physics, Tulane University

  • Jin Hu

    University of Arkansas-Fayetteville, Tulane University, University of Arkansas, Physics and Engineering physics department, Tulane Univ

  • David Graf

    NHMFL Tallahassee, NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory/Florida State University, Natl High Magnetic Field Lab, NHMFL at Florida State University, Florida State University, National High Magnetic Field Laboratory, Florida State University, Condensed Matter Science, NHMFL

  • Zhiqiang Mao

    Tulane University, Physics and Engineering physics department, Tulane Univ, Department of Physics and Engineering Physics, Tulane University, Tulane Univ, Department of Physics and Engineering Physics , Tulane University