The Origin of T_c Enhancement in Heterostructure Cuprate Superconductors
- Creators
- Bergman, Doron L.
- Pereg-Barnea, Tamar
Abstract
Recent experiments on heterostructures composed of two or more films of cuprate superconductors of different oxygen doping levels have shown a remarkable T_c 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.
Additional Information
© 2011 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). 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 T_c Superconductor) The authors wish to acknowledge useful discussions with O. Millo, N. Lindner, G. Refael and N.-C. Yeh. TPB acknowledges funding from the Research Corporation Cottrell Fellowship and DLB was supported by the Sherman Fairchild Foundation.Attached Files
Published - materials-04-01835.pdf
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Additional details
- Alternative title
- The Origin of Tc Enhancement in Heterostructure Cuprate Superconductors
- PMCID
- PMC5448879
- Eprint ID
- 66362
- Resolver ID
- CaltechAUTHORS:20160421-115419591
- Cottrell Scholar of Research Corporation
- Sherman Fairchild Foundation
- Created
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2016-04-21Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field