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Thermal transport properties of U2Ru2Sn at low temperatures

Sanchez, A.; Paschen, S.; Wosnitza, J.; Mydosh, J. A.; Strydom, A. M.; Du Plessis, P. D. V.; Steglich, F.


U2Ru2Sn has been classified as the first tetragonal U-based Kondo insulator. Here, we present measurements of the thermal conductivity k and thermopower S of high-quality single-crystalline U2Ru2Sn along and perpendicular to the tetragonal c-axis, in the temperature range between 100mK and 1K, in zero field and in a magnetic field of 6T. Below 400 mK, the phonon contribution to kðTÞ shows a T2 behaviour for both directions that can be attributed to phonons scattered by electrons. SðTÞ 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 2m0 along and 16m0 perpendicular to the c-axis, where m0 is the free-electron mass. This indicates that U2Ru2Sn has a highly anisotropic residual density of states within the pseudogap.

  • Physica B: Condensed Matter 359-361(2005), 1015


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