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Materials 2011, 4(10), 1835-1845; doi:10.3390/ma4101835
Article

The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors

1 and 1,2,*
1 Department of Physics, California Institute of Technology, 1200 E. California Blvd, MC114-36, Pasadena, CA 91125, USA 2 Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
* Author to whom correspondence should be addressed.
Received: 2 August 2011 / Revised: 24 September 2011 / Accepted: 9 October 2011 / Published: 17 October 2011
(This article belongs to the Special Issue New High Tc Superconductor)
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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.
Keywords: high Tc superconductivity; heterostructures; cuprates high Tc superconductivity; heterostructures; cuprates
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Bergman, D.L.; Pereg-Barnea, T. The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors. Materials 2011, 4, 1835-1845.

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