Is the Low Temperature Thermoelectric Power Behaviour an Evidence for the Multi-Channel Kondo Effect in UAS-1Se1=x ?

We have investigated the anisotropy and off-stoichiometry effects on the thermo electric power S(T) of uranium dipnictides - UP1.7As0.3 and UAs2 and arseno selenide - UAs1-xSe1+x. These two groups of compounds have tetragonal PbFCl-type structure and order at low temperatures anti- or ferromagnetically, respectively. The S(T) curves are strongly anisotropic for all the examined systems. The a -axis thermopower of the ferromagnetic Uas1-xSe1+x system shows a spectacular dependence of the shape of S(T) curve on x. This behaviour is discussed in the frame of the multi-channel Kondo model. (author)