Origin of heavy quasiparticles in UPt_3

Details Origin of heavy quasiparticles in UPt_3 Origin of heavy quasiparticles in UPt_3

2001-07-18

arxiv.org/abs/cond-mat/0107378v1

Physics

Condensed Matter

REVTEX, 4 pages, 3 figures

Scientific paper

We propose a microscopic description of heavy fermions in UPt_3. It is based on the assumption that two of the three 5f electrons of the U ions are localized. Band-structure calculations based on this supposition reproduce the observed de Haas-van Alphen frequencies very well. The observed enhancement of the quasiparticle mass as compared with the LDA band mass results from the local Coulomb interaction of the delocalized f electrons with the localized ones. Diagonalization of the Coulomb interaction matrix yields the level scheme of the localized f^2 states. Assuming a splitting of the ground-state doublet by the crystal field of similar size as in UPd_2Al_3 results in a mass enhancement factor of order 10 in agreement with experiments.

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