Low-energy excitations in heavy fermion systems.

Zwicknagl G., Runge E., Christensen N.E.

Band structure effects play an important role in determining the low-energy excitations in heavy fermion systems. The influence of coherence is evidenced by the recent de Haas-van Alphen experiments where well-defined Fermi surfaces for the heavy quasiparticles are observed and determined. Quasiparticle states in highly correlated electron systems can be described within the renormalized band method which merges realistic ab initio band calculations with phenomenological Fermi liquid considerations. The authors now compare calculated Fermi surfaces and quasiparticle bands of heavy fermion compounds with measured dHvA data. Emphasis is placed on the question: how do high effective masses and crystalline electric field (CEF) splitting influence the Fermi surface topology? Under which conditions can one expect conventional band theory to predict the correct Fermi surface?.

Physica B, 163 97-9, 1990.

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