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A first‐principles approach to high‐ T c superconductivity. II. The superconducting ground state
Author(s) -
Fritsche L.
Publication year - 1993
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560480305
Subject(s) - superconductivity , ground state , condensed matter physics , electron , cooper pair , physics , phonon , bcs theory , quantum mechanics , pairing
We show that a consistent N ‐electron theory of a solid can within the Born–Oppenheimer ( BO ) approximation lead only to normal conductivity or to an insulating state. If one leaves the BO approximation by turning on electron–phonon interaction, one can establish a lower‐lying new ground state that has the characteristic properties of the Bardeen–Cooper–Schrieffer ( BSC ) ground state. We demonstrate that an ( N + N n )‐particle Schrödinger equation that describes the motion of N electrons and N n nuclei of a solid can lead only to phonon‐induced superconductivity. © 1993 John Wiley & Sons, Inc.