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 magneto transport 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.
Y. S. Eo and S. Liu and S. R. Saha and H. Kim and S. Ran and J. A. Horn and H. Hodovanets and J. Collini and T. Metz and W. T. Fuhrman and A. H. Nevidomskyy and J. D. Denlinger and N. P. Butch and M. S. Fuhrer, "C -Axis Transport in Ute2: Evidence of Three-Dimensional Conductivity Component," Physical Review B, vol. 106, no. 6, article no. L060505, American Physical Society, Aug 2022.
The definitive version is available at https://doi.org/10.1103/PhysRevB.106.L060505
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01 Aug 2022