2001/07/18 by G. Zwicknagl, Gertrud Zwicknagl, Zwicknagl, G. +5
Physics and Astronomy · #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0107378
REVTEX, 4 pages, 3 figures
arxiv created 2001/07/18 · arxiv updated 2009/11/30
We propose a microscopic description of heavy fermions in UPt3. 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 f2 states. Assuming a splitting of the ground-state doublet by the crystal field of similar size as in UPd2Al3 results in a mass enhancement factor of order 10 in agreement with experiments.