A Review of the Theory of Heavy Fermions

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Abstract
Many of the highly anomalous properties of heavy electron metal can be explained by assuming that to gain hybridization energy,a small number of electrons are promoted from an f-level well below the Fermi energy. The f-states form an almost localized Fermi liquid with a very large effective mass due to the many low energy spin fluctuations of the f-states. Spin-fluctuation mediated interactions generally favor unconventional rather than s-wave singlet superconductivity. A sure sign of an unconventional form of superconductivity would be to observe an anisotropy in the electronic of lattice properties.

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