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Abstract: In the framework of the diagrammatic method with self-consistent field, themaximum on the temperature dependence of the susceptibility of a weakly dopednarrow-band Hubbard magnet below the Curie temperature $T { m C}$ ispredicted. By numerical calculations, it is proved that it appears at smallhole concentrations $n {h}$. In this case, the temperature dependence of themagnetization $M$$T$ has a typical Fermi-like shape with the point ofinflection at a temperature $T { m inf}$. The approximate solution of thesystem of equations for the mean spin and the chemical potential gives theSchottky susceptibility typical of a two-level system with a gap of order of$n {h}1-n {h}W$, where W is the bandwidth. This behavior reflects theexistence of two subbands with up- and down-spins. It may be observedexperimentally in the surface layers of oxide metal nanoparticles with narrowbands and a weak oxygen nonstoichiometry.



Author: E.E. Zubov

Source: https://arxiv.org/







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