Abstract
The thermal conductivity and the Lorenz function have been studied, along the two crystallographicdirections a and c in the temperature range of 5–300 K, in a single crystal of the compoundU2Ru2Sn, which behaves as a weak Kondo semiconductor with a gap of order 150 K. Theobserved large anisotropy results from both the considerable difference in thelattice parameters of the tetragonal structure and the difference in the type ofthermal conductivity, i.e. crystal and quasi-amorphous ones. The contribution ofbipolarons in the thermal conductivity confirms the semiconducting character ofthis compound. The presented results of the thermal conductivity of a uraniumcompound, which does not exhibit magnetic order, complete the examinationsof the influence of phase transitions on heat transport in the antiferromagneticUNi0.5Sb2 (Mucha et al 2006 J. Phys.: Condens. Matter. 18 3097) and ferromagneticUCu2Si2 compounds (Mucha et al 2008 Solid State Commun. at press).
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