[Zurück]

A. Sanchez, S. Paschen, J. Wosnitza, J.A. Mydosh, A.M. Strydom, P. de V. d Plessis, F. Steglich:
"Thermal transport properties of U₂Ru₂Sn at low temperatures";
Physica B: Condensed Matter, 359-361 (2005), S. 1015 - 1017.

U2Ru2Sn 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 U2Ru2Sn 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 T2 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 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.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938173

http://dx.doi.org/10.1016/j.physb.2005.01.382