Microscopic description of origin of heavy quasiparticles in UPt3

Zwicknagl, G.; Yaresko, A. N.; Fulde, P.

doi:10.1103/PhysRevB.65.081103

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Microscopic description of origin of heavy quasiparticles in UPt₃

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Yaresko, A. N.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fulde, P.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zwicknagl, G., Yaresko, A. N., & Fulde, P. (2002). Microscopic description of origin of heavy quasiparticles in UPt₃. Physical Review B, 65(8): 081103, pp. 081103-081103. doi:10.1103/PhysRevB.65.081103.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-31AB-A

Abstract

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 quasi-particle mass as compared with the. local-density approximation 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 UPd2Al3 results in a masks enhancement factor of order 10 in agreement with experiments.