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Identifying the Pairing Mechanism in High-Tc Superconductors

Published online by Cambridge University Press:  21 February 2011

J.B. Goodenough
Affiliation:
Center for Materials Science & Engineering, ETC 5.160 University of Texas at Austin, Austin, TX 78712–1084
A. Manthiram
Affiliation:
Center for Materials Science & Engineering, ETC 5.160 University of Texas at Austin, Austin, TX 78712–1084
J. Zhou
Affiliation:
Center for Materials Science & Engineering, ETC 5.160 University of Texas at Austin, Austin, TX 78712–1084
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Abstract

It is argued that the origin of the high transition temperatures observed in Ba1−xKxBiO3 and the copper-oxide superconductors with perovskite-related structures is due to two factors: (1) overlap of a partially filled σ* band of primarily cation character and a π or π* band of mostly O-2 parentage permits charge transfer between cation and anion subarrays with oxygen-atom displacement perpendicular to a M-O-M bond axis and (2) bondlength mismatch places the M-O-M bondlength under a compressive or tensile stress. Relief of a compressive stress by the bending of a M-O-M bond from 180° introduces a strong electron-lattice interaction with holes; a 180° Cu-O-Cu bond allows strong electronlattice coupling with electrons of a Cu2+/+ redox couple, but not with holes in a Cu3+/2+redox couple.

Type
Research Article
Copyright
Copyright © Materials Research Society 1989

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References

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