Magnetic Anisotropy and Berry-Phase Transport in Ferromagnetic NdGaGe Single Crystals

ORAL

Abstract

I will present results on single-crystal X-ray diffraction, magnetization, magnetic susceptibility, heat capacity, magnetotransport, and Hall transport measurements of NdGaGe (Neodymium–Gallium–Germanium) single crystals grown using a high-temperature Ga flux method. X-ray diffraction confirms a tetragonal structure, with refinements suggesting competition between centrosymmetric (I4₁/amd) and non-centrosymmetric (I4₁md) space groups. The possible lack of inversion symmetry can enhance Berry-curvature-driven transport phenomena. Magnetic and thermodynamic measurements show that NdGaGe is a ferromagnet with a Curie temperature of about 8.2 K and a strong easy axis along the c-direction. Magnetoresistance and magnetization are highly anisotropic, and Hall-effect measurements reveal a large anomalous Hall effect (AHE) below TC. The dominance of the anomalous Hall term indicates a primarily intrinsic contribution from Berry curvature linked to spin–orbit coupling.

*This work is supported by the U.S. Department of Energy, Office of Basic Energy Sciences (DOE-BES) under the project DE-SC0025735.

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Presenters

  • Tobias R Beyer

    • Kennesaw State University

Authors

  • Tobias R Beyer

    • Kennesaw State University

  • Madalynn Marshall

    • Kennesaw State University

  • David E Graf

    • Florida State University
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Florida State University

  • Huibo Cao

    • Oak Ridge National Laboratory

  • Silu Huang

    • University of South Carolina

  • Rongying Jin

    • University of South Carolina

  • Andrew D Christianson

    • ORNL

  • Chetan Dhital

    • Kennesaw State University