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The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors.


ABSTRACT: Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable Tc enhancement (up to 50%) relative to single compound films. We provide a simple explanation of the enhancement which arises naturally from a collection of experimental works. We show that the enhancement could be caused by a structural change in the lattice, namely an increase in the distance of the apical oxygen from the copper-oxygen plane. This increase modifies the effective off-site interaction in the plane which in turn enhances the d-wave superconductivity order parameter. To illustrate this point we study the extended Hubbard model using the fluctuation exchange approximation.

SUBMITTER: Bergman DL 

PROVIDER: S-EPMC5448879 | BioStudies | 2011-01-01

SECONDARY ACCESSION(S): 10.3390/ma4101835

REPOSITORIES: biostudies

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