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Superconductivity originating from quasi‐orbital electrons II. The superconducting ground state of quasi‐orbital conduction electrons

1978; Wiley; Volume: 85; Issue: 2 Linguagem: Inglês

10.1002/pssb.2220850211

1521-3951

Ekkehard Krüger,

Rare-earth and actinide compounds

Abstract It is shown that the electrons of a certain narrow half‐filled band couple to Cooper pairs below a transition temperature T c if these electrons behave similar to orbital electrons. This transition is nearly the same as that described by the BCS theory. However, the coupling of the electrons to Cooper pairs is constrained in a new manner by quasi‐classical constraining forces. A comparison of band structure calculations with superconducting properties of metals suggests that quasiclassical constraining forces must exist in any superconducting state. As a result, only those metals become superconducting which have a narrow half‐filled band of a certain symmetry type in their band structure.