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Magnetic structure evolution in the Mn(Bi,Sb)<sub>2</sub>Te<sub>4</sub> family of intrinsic magnetic topological insulators

ORAL

Abstract

The Mn(Bi,Sb)2Te4 family of intrinsic magnetic topological insulators has been predicted to be an ideal platform to realize a high temperature quantum anomalous Hall state, an axion insulating state, as well as a variety of other non-trivial band topologies. The strong coupling between the magnetic ordering in these compounds and the details of their band structure makes understanding their magnetic structure and its evolution with chemistry and magnetic field critical for understanding these exotic states. Our prior work has demonstrated that the field driven spin canting in MnBi2Te4 drives the measured intrinsic anomalous Hall effect in that compound but there are many questions to be addressed about the details of the evolution of the magnetic phase diagram in this system as the Bi atoms are replaced with Sb [1]. Prior magnetometry and magnetotransport shows a clear bulk magnetic behavior change with increased Sb content, but the microscopic details of this evolution are unclear [2]. We will present structural and magnetic neutron scattering measurements and other magnetic characterization of the Mn(Bi,Sb)2Te4 family of compounds to clarify this evolution.

[1] S. H. Lee et al., Phys. Rev. Research 1, 012011(R)
[2] J.-Q. Yan et al., arXiv:1905.00400 (2019).

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Presenters

  • Colin Heikes

    National Institute of Standards and Technology

Authors

  • Colin Heikes

    National Institute of Standards and Technology

  • Patrick Quarterman

    National Institute of Standards and Technology

  • Yangyang Chen

    Physics, The Pennsylvania State University, Pennsylvania State University, Department of physics, ICQM, Peking University

  • Ya-Wen Chuang

    Physics, The Pennsylvania State University, Pennsylvania State University

  • Seng Huat Lee

    2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Pennsylvania State University, MRI, Penn State University

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Pennsylvania State University, Penn State University, Physics, Penn State University, Pennsylvania state University

  • Kevin Honz

    Physics, The Pennsylvania State University, Pennsylvania State University

  • Yingdong Guan

    Physics, The Pennsylvania State University, Pennsylvania State University

  • Yu Wang

    Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, Penn State University, Pennsylvania state University

  • Ke Wang

    Materials Research Institute, The Pennsylvania State University, Pennsylvania State University, Materials Research Institute, Pennsylvania State University

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University

  • Jun Zhu

    Pennsylvania State University, Physics, The Pennsylvania State University

  • Pawel Zajdel

    Institute of Physics, University of Silesia, University of Silesia

  • Julie Ann Borchers

    National Institute of Standards and Technology Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology

  • William Ratcliff

    National Institute of Standards and Technology