The dual nature of 5f electrons and origin of heavy fermions in U compounds
arXiv:cond-mat/0211706 · doi:10.1088/0953-8984/15/28/302
Abstract
We develop a theory for the electronic excitations in UPt which is based on the localization of two of the electrons. The remaining electron is delocalized and acquires a large effective mass by inducing intra-atomic excitations of the localized ones. The measured deHaas-vanAlphen frequencies of the heavy quasiparticles are explained as well as their anisotropic heavy mass. A model calculation for a small cluster reveals why only the largest of the different hopping matrix elements is operative causing the electrons in other orbitals to localize.
6 pages, 3 figures