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Revisiting Hall coefficient measurements in samarium hexaboride

ORAL

Abstract

Samarium hexaboride is a correlated material in which strong f-d interactions open a small gap at the Fermi energy below ~100 K. In transport, SmB6 demonstrates activated behavior down to ~4 K, terminated by a conduction mechanism attributed to the emergence of a topological surface state. We present a study of transport, especially Hall coefficient, from three perspectives. First, we discuss a method of analyzing Hall data at low temperatures, allowing for accurate extraction of mobility from the conductive surface. Next, we re-examine a well-known high-temperature feature in Hall data: the sign change from negative to positive as temperature is raised above ~65 K. This sign change has been attributed to skew scattering due to the strong f-d interactions, but it leads to an inaccurate determination of carrier density and mobility. We discuss a method to improve the accuracy of transport analysis that relies on ARPES data at high temperature to correct for the positive Hall sign. Finally, we present a method of carving a micron-sized Hall bar from SmB6 to investigate the effect of sample size on transport parameters. Taken together, these results aim to provide a summary of current transport perspectives on SmB6.

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Presenters

  • Alexa Rakoski

    Department of Physics, Univ of Michigan - Ann Arbor

Authors

  • Alexa Rakoski

    Department of Physics, Univ of Michigan - Ann Arbor

  • Yun Suk Eo

    University of Maryland, College Park, Center for Nanophysics and Advanced Materials, University of Maryland, Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park, Center for Quantum Materials, University of Maryland

  • Dmitri Mihaliov

    Department of Physics, Univ of Michigan - Ann Arbor

  • Cagliyan Kurdak

    Department of Physics, Univ of Michigan - Ann Arbor

  • Priscila Rosa

    Los Alamos National Laboratory, Los Alamos Natl Lab, Los Alamos National Laboratory, USA

  • Zachary Fisk

    Department of Physics and Astronomy, University of California Irvine, Department of Physics and Astronomy, University of California, Irvine, Dept. of Physics and Astronomy, University of California Irvine, University of California, Irvine, USA, Department of Physics and Astronomy,, University of California-Irvine

  • Boyoun Kang

    Gwangju Institute of Science and Technology

  • Myung-suk Song

    Gwangju Institute of Science and Technology

  • Beongki Cho

    Gwangju Institute of Science and Technology

  • Monica Ciomaga Hatnean

    Department of Physics, University of Warwick

  • Geetha Balakrishnan

    University of Warwick, Department of Physics, University of Warwick, Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom