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The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors

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.
Materials 2011, 4(10), 1835-1845; https://doi.org/10.3390/ma4101835
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)
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. View Full-Text
Keywords: high Tc superconductivity; heterostructures; cuprates high Tc superconductivity; heterostructures; cuprates
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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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