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Superconductivity of strongly correlated electrons: heavy-fermion systems

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Steglich, F. (1990). Superconductivity of strongly correlated electrons: heavy-fermion systems. In Earlier and Recent Aspects of Superconductivity. Lectures from the International School (pp. 306-325).

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D521-4
The Cooper pairs in the superconductors CeCu 2Si 2, UBe 13, UPt 3, and URu 2Si 2 are formed by quasiparticles with effective mass m* of order 100 m el. m* originates in very strong correlations between f-electrons which become weakly delocalized well below a characteristic temperature T*~5-50 K via a Kondo-type mechanism. These `heavy fermions' dominate the low-temperature properties of a number of lanthanide- and actinide-based compounds, spanning the full range between coherent Fermi liquid, band magnetism and superconductivity. The pairing interaction in the `heavy-fermion superconductors' is likely to differ from the BCS-type phonon-mediated coupling. In addition, their order parameters appear to be highly anisotropic. Most of the experimental evidence points to even-parity (`singlet') rather than odd-parity (`triplet') pairing.