Abstract
Abstract Single crystals of URhGa 5 and URh 0.97 Pd 0.03 Ga 5 grown by the self-flux method were examined by X-ray diffraction, thermoelectric power, thermal and electrical conductivity, magnetization, and specific heat measurements. The giant thermoelectric peak exceeding 250 μV/K at 15 K observed for just grown URh 0.97 Pd 0.03 Ga 5 crystals decreased drastically with ageing. Three percent palladium for Ru substitution in URhGa 5 weakly changes the thermoelectric power beyond the peak area but substantially increases the electronic specific heat and magnetic susceptibility. The results of the diffusion thermoelectric power calculation, based on the electron structure and the Fermi surface literature data, are consistent with the determined data for URhGa 5 crystal and its URh 0.97 Pd 0.03 Ga 5 derivative.
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