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Superconductivity originating from quasi‐orbital electrons I. The model of quasi‐orbital conduction electrons
Author(s) -
Krüger E.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220850129
Subject(s) - electron , condensed matter physics , superconductivity , physics , adiabatic process , adiabatic theorem , atomic orbital , coulomb , thermal conduction , orbital motion , quantum mechanics , atomic physics , angular momentum
It will be shown that an adequate description of superconductivity can be given, similar to ferromagnetism, in terms of „quasi‐orbital” conduction electrons, i.e., of conduction electrons occupying repeatedly for a short time localized orbitals and so performing a kind of hopping motion through the crystal. The present theory is based on the observation that the bands of superconducting metals, and only these, yield a distinct type of localized functions. It is shown that quasi‐orbital electrons cannot be described in the framework of the adiabatic approximation when they are assigned to the narrowest bands of the metals. The non‐adiabatic system requires an extension of the operator of the Coulomb interaction. This non‐adiabatic interaction leads to a spin‐phonon interaction for the bands existing in superconductors.