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Title: New mechanism for superconductivity

Abstract

The recent discovery of high-temperature superconductivity in certain mixed copper oxides has aroused much attention, not only because of possible practical applications but also because it cannot easily be explained in terms of the conventional Bardeen-Copper-Schrieffer (BCS) mechanism. Here, a radically different alternative is suggested, based on electron hopping between atoms of a metal in two different valence states under the control of two cooperating lattice vibrations. Other interpretations have involved variants of BCS theory, being likewise based on the conventional band theory of solids and electron-phonon coupling. The mechanism suggested here postulates a strong coupling between pairs of lattice vibrations and electron hopping, leading to a breakdown of the Born-Oppenheimer approximation in a manner reminiscent of that involved in the Jahn-Teller effect. Such a situation cannot be discussed in terms of conventional band theory because this rests on the Born-Oppenheimer approximation. While the possibility that electron hopping might be involved in these new materials has been recognized, the essential feature of the mechanism suggested here is novel.

Authors:
Publication Date:
Research Org.:
Texas Univ., Austin (USA). Dept. of Chemistry
OSTI Identifier:
6885868
Report Number(s):
AD-A-198404/6/XAB
Resource Type:
Technical Report
Resource Relation:
Other Information: Pub. in Angewandte Chemie, Vol. 26, No. 12, 1273-1275(Dec 1987)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COPPER COMPOUNDS; CUPRATES; SUPERCONDUCTIVITY; BCS THEORY; COPPER OXIDES; ELECTRON TRANSFER; ELECTRON-PHONON COUPLING; ELECTRONS; LATTICE VIBRATIONS; MIXING; OXIDES; SOLIDS; SUPERCONDUCTORS; VARIATIONS; CHALCOGENIDES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTARY PARTICLES; FERMIONS; LEPTONS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Dewar, M J. New mechanism for superconductivity. United States: N. p., 1987. Web.
Dewar, M J. New mechanism for superconductivity. United States.
Dewar, M J. Tue . "New mechanism for superconductivity". United States.
@article{osti_6885868,
title = {New mechanism for superconductivity},
author = {Dewar, M J},
abstractNote = {The recent discovery of high-temperature superconductivity in certain mixed copper oxides has aroused much attention, not only because of possible practical applications but also because it cannot easily be explained in terms of the conventional Bardeen-Copper-Schrieffer (BCS) mechanism. Here, a radically different alternative is suggested, based on electron hopping between atoms of a metal in two different valence states under the control of two cooperating lattice vibrations. Other interpretations have involved variants of BCS theory, being likewise based on the conventional band theory of solids and electron-phonon coupling. The mechanism suggested here postulates a strong coupling between pairs of lattice vibrations and electron hopping, leading to a breakdown of the Born-Oppenheimer approximation in a manner reminiscent of that involved in the Jahn-Teller effect. Such a situation cannot be discussed in terms of conventional band theory because this rests on the Born-Oppenheimer approximation. While the possibility that electron hopping might be involved in these new materials has been recognized, the essential feature of the mechanism suggested here is novel.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {12}
}

Technical Report:
Other availability
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