Abstract

Disordered substitutional alloys (Gd1–xRx)mMn represent a very interesting alloy family showing both well defined (no orbital contribution) randomly distributed localized spins (Gd) and itinerant electron bands with a population depending on the concentration x. Because of the complicated many-body task, only the paramagnetic state was considered. The influence of the external uniform magnetic field was also discussed. The main contribution to the thermoelectric power (TEP) has a magnetic origin and is caused by scattering of the conducting electrons on the stochastic distributions of the large Gd spin (S = 7/2ħ) over the lattice sites. The many-body approximations used for our models are based on the alloy analogy approximations for the fictitious electronic alloys. Band structure calculations yielding informations on the widths and positions of the itinerant bands were performed. The results on TEP as a function of alloy concentration x fit well the experimental results.

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