Origin of the T$_c$ enhancement in heterostructure cuprate superconductors

Details Origin of the T$_c$ enhancement in heterostructure cuprate superconductors Origin of the T$_c$ enhancement in heterostructure cuprate superconductors

2010-09-16

arxiv.org/abs/1009.3278v1

Materials. 2011; 4(10):1835-1845

Physics

Condensed Matter

Superconductivity

Scientific paper

10.3390/ma4101835

Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels\cite{Yuli,Gozar} have shown a remarkable T$_c$ enhancement (up to 50%) relative to single compound films. We provide here 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.

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