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The Angular Dependence of Magnetoresistance in YMn<sub>6</sub>Sn<sub>6</sub>

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Abstract

YMn6Sn6 is a member of the ternary Kagome magnets, known for their frustration-driven ground states and novel phenomena. YMn6Sn6 orders in an easy plane commensurate antiferromagnetic phase below TN = 345K, transitioning to an incommensurate double helical (DH) structure upon further cooling. With field in the ab-plane, this DH structure evolves between multiple helical and fan-like phases. Of these, the transverse conical spiral, shows a large topological Hall effect where the scalar spin chirality is stabilized by thermal fluctuation, similar to the nematic susceptibility of Fe-based superconductors1. Electronic band structure calculations show topological character near EF, making YMn6Sn6 a candidate to investigate the interplay between the electronic topology and magnetic topological properties. Here we report signatures in the magnetoresistance indicating strong coupling between the magnetic structure and the electronic band structures. Regardless of field orientation, a decrease in resistivity above 6T indicates a strong effect on the electronic properties, independent of magnetization, implying alteration of the topological electronic bands via applied field.

1Ghimire, N. J., et al. arXiv:2007.02399 (2020).

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Presenters

  • Peter Siegfried

    Department of Physics, University of Colorado, Boulder, Physics and Astronomy, George Mason University, Physics, George Mason University

Authors

  • Peter Siegfried

    Department of Physics, University of Colorado, Boulder, Physics and Astronomy, George Mason University, Physics, George Mason University

  • Igor Mazin

    Physics & Astronomy, George Mason University, Department of Physics and Astronomy, George Mason University, George Mason University, Physics and Astronomy, George Mason University, Physics, George Mason University, Department of Physics and Astronomy,, George Mason University, Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University – Fairfax, VA, USA

  • David Jones

    Physics, George Mason University, Department of Physics and Astronomy, George Mason University

  • Hari Bhandari

    Physics, George Mason University

  • Nirmal Jeevi Ghimire

    George Mason University, Argonne National Laboratory, Physics and Astronomy, George Mason University, Department of Physics and Astronomy, George Mason University, Physics, George Mason University