Abstract
U 2 Ru 2 Sn has been classified as the first tetragonal U-based Kondo insulator. Here, we present measurements of the thermal conductivity κ and thermopower S of high-quality single-crystalline U 2 Ru 2 Sn along and perpendicular to the tetragonal c-axis, in the temperature range between 100 mK and 1 K, in zero field and in a magnetic field of 6 T. Below 400 mK, the phonon contribution to κ ( T ) shows a T 2 behaviour for both directions that can be attributed to phonons scattered by electrons. S ( T ) presents a linear behaviour in the whole temperature range. S is positive along the c-axis and negative perpendicular to the c-axis. Using a one-band model the effective mass m * is estimated to be 2 m 0 along and 16 m 0 perpendicular to the c-axis, where m 0 is the free-electron mass. This indicates that U 2 Ru 2 Sn has a highly anisotropic residual density of states within the pseudogap.
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