High-temperature interface superconductivity between metallic and insulating copper oxides

A. Gozar, G. Logvenov, L. Fitting Kourkoutis, A. T. Bollinger, L. A. Giannuzzi, D. A. Muller and I. Bozovic ()
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A. Gozar: Brookhaven National Laboratory, Upton, New York 11973-5000, USA
G. Logvenov: Brookhaven National Laboratory, Upton, New York 11973-5000, USA
L. Fitting Kourkoutis: School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
A. T. Bollinger: Brookhaven National Laboratory, Upton, New York 11973-5000, USA
L. A. Giannuzzi: FEI Company, Hillsboro, Oregon 97124, USA
D. A. Muller: School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
I. Bozovic: Brookhaven National Laboratory, Upton, New York 11973-5000, USA

Nature, 2008, vol. 455, issue 7214, 782-785

Abstract: Skin-deep superconductivity High-temperature interface superconductivity, confined to nanometre-size interfaces between two non-superconducting materials, has been long sought-after. Theorists speculated about it for forty years, but it has been elusive because of extreme demands on interface perfection and materials parameters. Gozar et al. now report the discovery of interface superconductivity between two non-superconducting cuprates — an insulator (La2CuO4) and a metal (La1.55Sr0.45CuO4). The critical tempeature (Tc) in bilayers is about 15 K or 30 K, depending on the layering sequence. This highly robust phenomenon is confined to within 2 or 3 nanometres of the interface, and if the bilayer is exposed to ozone, Tc rises to over 50 K.

Date: 2008
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DOI: 10.1038/nature07293

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