The peculiarities of δ-plutonium electronic structure and magnetic susceptibility

The calculations of electronic density of states, exchange-enhanced spin and orbital magnetic susceptibility of plutonium in its δ-phase existing region are performed in terms of a generalized s(p)df-model, which enables to take the intra-site Hubbard ff-, dd-interactions and inter-site df-exchange interaction into account along with s,p,f and d-electrons band movement and orbital splitting of f-states. It is shown that the splitting of the electronic spectra induced by fluctuating exchange fields leads to appearing of the temperature-induced local magnetic moments, to changing of d,f-bands occupation numbers with temperature and to appearing of charge fluctuations induced by spin fluctuations. A good agreement with the experimental data on temperature dependencies of magnetic susceptibility of Pu0.95Ga0.05 and Pu0.957Ga0.043 alloys is obtained.