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Reservoir Layers in High Tc Mercury Cuprates

Published online by Cambridge University Press:  10 February 2011

T. H. Geballe ,
Boris Y. Moyzhes  and
P. H. Dicktnson
T. H. Geballe
Affiliation:
Dept. of Applied Physics, Stanford University, Stanford, CA 94305, Geballe@stanford.edu
Boris Y. Moyzhes
Affiliation:
E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305
P. H. Dicktnson
Affiliation:
Chromatic Research Inc., Sunnyvale, CA 94089
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Abstract

We put forward the hypothesis that cations with 6s electrons (Hg,Tl,Pb,Bi) in the charge reservoir layers of high Tc cuprate superconductors actively participate in the pairing interaction as negative-U centers. We further argue that the Hg-cuprates are outstanding superconductors (Tc > 160 K) because they can exist as two-ion negative-U centers, . Their electrons are less localized than in single-site centers (negative-U or bipolaron) and can have a strong pairing interaction with a smaller increase in effective mass. The centers are oriented in the x and y directions and can have phase differences compatible with the d-wave symmetry of the CuO2 planes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 574: Symposia BB – Multicomponent Oxide Films for Electronics , 1999 , 151
Copyright
Copyright © Materials Research Society 1999

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References

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