Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of heavy quasiparticles in UPt_3   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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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
25
The categories of this paper are: patt-sol