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  • Letter

c-axis transport in UTe2: Evidence of three-dimensional conductivity component

Yun Suk Eo1, Shouzheng Liu2, Shanta R. Saha1, Hyunsoo Kim1,*, Sheng Ran1,3,†, Jarryd A. Horn1, Halyna Hodovanets1,*, John Collini1, Tristin Metz1 et al.

Wesley T. Fuhrman1, Andriy H. Nevidomskyy4, Jonathan D. Denlinger5, Nicholas P. Butch1,3, Michael S. Fuhrer6,7, L. Andrew Wray2, and Johnpierre Paglione1,8,‡

  • 1Maryland Quantum Materials Center and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 2Department of Physics, New York University, New York, New York 10003, USA
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 4Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
  • 5Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6School of Physics and Astronomy, Monash University, Victoria 3800, Australia
  • 7ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, Victoria 3800, Australia
  • 8Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8

  • *Present Address: Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
  • †Present address: Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130, USA.
  • ‡paglione@umd.edu
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Phys. Rev. B 106, L060505 – Published 24 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L060505

Abstract

We study the temperature dependence of electrical resistivity for currents directed along all crystallographic axes of the spin-triplet superconductor UTe2. We focus particularly on an accurate determination of the resistivity along the c axis (ρc) by using a generalized Montgomery technique that allows extraction of crystallographic resistivity components from a single sample. In contrast to expectations from the observed highly anisotropic band structure, our measurement of the absolute values of resistivities in all current directions reveals a surprisingly nearly isotropic transport behavior at temperatures above Kondo coherence, with ρc∼ρb∼2ρa, that evolves to reveal qualitatively distinct behaviors on cooling. The temperature dependence of ρc exhibits a peak at a temperature much lower than the onset of Kondo coherence observed in ρa and ρb, consistent with features in magnetotransport and magnetization that point to a magnetic origin. A comparison to the temperature-dependent evolution of the scattering rate observed in angle-resolved photoemission spectroscopy experiments provides important insights into the underlying electronic structure necessary for building a microscopic model of superconductivity in UTe2.

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Phys. Rev. B 106, L060505– Published 24 August, 2022
  • Received 25 January 2021
  • Accepted 1 August 2022
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