Drag induced giant anomalous Nernst effect in Ferromagnetic MnBi

ORAL

Abstract

Anomalous Nernst effect (ANE) is the thermal equivalent to the Anomalous Hall effect (AHE). It has been observed in various materials and attributed to the Berry curvature of topological materials. In this talk, we present the observation of giant anomalous Nernst effect in MnBi single crystals. In addition to intrinsic contribution from the band structure, magnon drag also contributes to the anomalous Nernst signal in MnBi crystals, resulting in a giant anomalous Nernst thermopower of 18 μV/K at 0.6 T. At the same time, we also observe a magnon drag thermopower and positive magnetothermal conductivity. This magnon drag induce anomalous Nernst effect can be viewed as a self-spin Seebeck effect, which provides alternative path of understanding the electron magnon interaction.

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Presenters

  • Bin He

    • Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids

Authors

  • Bin He

    • Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids

  • Cuneyt Sahin

    • Univ of Iowa
    • University of Iowa
    • Department of Physics and Astronomy, The University of Iowa

  • Stephen R Boona

    • The Ohio State University

  • Brian Sales

    • Oak Ridge National Lab

  • Joseph P C Heremans

    • Department of Mechanical Engineering, Ohio State Univ - Columbus
    • Ohio State Univ - Columbus
    • The Ohio State University

  • Michael Flatté

    • Optical Science and Technology Center and Department of Physics, The University of Iowa
    • Department of Physics and Astronomy, University of Iowa
    • University of Iowa
    • Univ of Iowa
    • University of Iowa, University of Chicago, and Eindhoven University of Technology
    • Physics and Astronomy, University of Iowa
    • Department of Physics and Astronomy, The University of Iowa

  • Claudia Felser

    • Max Planck Institute for Chemical Physics of Solids
    • MPI-CPfS Dresden
    • Max Planck Institute For Chemical and Physical Solids
    • MPI for chemical physics of solids, Dresden
    • Solid State Chemistry, Max Planck Institute Chemical Physics of Solids
    • Max Planck Institute
    • Max-Planck-Institute for Chemical Physics of Solids , Nöthnitzer Straße-40, 01187 Dresden, Germany
    • Max Planck Inst
    • Max Planck Dresden
    • Chemical Physics of Solids, Max Planck Institute