Electric field induced superconductivity in an overdoped cuprate superconductor

Cuprate superconductors have a low carrier density and therefore their properties can be modified by an electric field. We describe an experiment where we observe field induced superconductivity on the surface of a cuprate material which is overdoped compared to optimal hole doping for maximum T c ....

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1994-12, Vol.235, p.2097-2098
Main Authors: Matijasevic, V.C., Bogers, S., Chen, N.Y., Appelboom, H.M., Hadley, P., Mooij, J.E.
Format: Article
Language:English
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Summary:Cuprate superconductors have a low carrier density and therefore their properties can be modified by an electric field. We describe an experiment where we observe field induced superconductivity on the surface of a cuprate material which is overdoped compared to optimal hole doping for maximum T c . Ca-doped SmBa 2Cu 3O y films were grown by molecular beam epitaxy in an ozone beam. Ca doping causes an increase in hole concentration of the SmBa 2Cu 3O y and a decrease in T c from 90K to 50K. BaTiO 3 is used as a dielectric across which an electric field is applied. We have observed an increase in T c of about 1K when a positive voltage is applied.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(94)92269-1