Anisotropic inelastic scattering and its interplay with superconductivity in URu${}_2$Si${}_2$

Abstract

In contrast to almost all anisotropic superconductors, the upper critical field of URu${}_2$Si${}_2$ is larger when the field is oriented along the less conducting direction. We present a study of resistivity and Seebeck coefficient extended down to sub-Kelvin temperature range uncovering a singular case of anisotropy. When the current is injected along the c-axis URu${}_2$Si${}_2$ behaves as a low-density Fermi liquid. When it flows along the a-axis, even in presence of a large field, resistivity remains T-linear down to T${}_c$ and the Seebeck coefficient undergoes a sign change at very low temperatures. We conclude that the characteristic energy scale is anisotropic and vanishingly small in the basal plane.

5 pages, 4 figures, 1 table

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