The dual nature of 5f electrons and origin of heavy fermions in U compounds

Abstract

We develop a theory for the electronic excitations in UPt${}_3$ which is based on the localization of two of the $5f$ electrons. The remaining $f$ 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 $5f$ hopping matrix elements is operative causing the electrons in other orbitals to localize.

arXiv comment6 pages, 3 figures

References in corpus (2)

• The Nature of Heavy Quasiparticles in Magnetically Ordered Heavy Fermions
• Correlation mechanism of the f-electron delocalization

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