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cond-mat2001
Origin of heavy quasiparticles in UPt_3
G. Zwicknagl, A. N. Yaresko, P. Fulde
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 calcul…
cond-mat.stat-mech2001
Effective classical Hamiltonians for spin systems: A closed form with quantum spin-wave effects
D. A. Garanin, D. V. Dmitriev, P. Fulde
Thermodynamic properties of any quantum spin system can be described by the formally exact, although in general intractable, effective classical Hamilton function \cal H. Here we o…