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Superfluid Density in Ultrathin YBCO Films

Published online by Cambridge University Press:  18 March 2011

Lyuba A. Delimova ,
Igor V. Grekhov ,
Ivan A. Liniichuk ,
Ivan A. Veselovsky ,
Konstantin B. Traito  and
Erkki Lahderanta
Lyuba A. Delimova
Affiliation:
Ioffe Institute RAS, 26 Politekhnicheskaya, St.Petersburg 194021, Russia
Igor V. Grekhov
Affiliation:
Ioffe Institute RAS, 26 Politekhnicheskaya, St.Petersburg 194021, Russia
Ivan A. Liniichuk
Affiliation:
Ioffe Institute RAS, 26 Politekhnicheskaya, St.Petersburg 194021, Russia
Ivan A. Veselovsky
Affiliation:
Ioffe Institute RAS, 26 Politekhnicheskaya, St.Petersburg 194021, Russia
Konstantin B. Traito
Affiliation:
Ioffe Institute RAS, 26 Politekhnicheskaya, St.Petersburg 194021, Russia
Erkki Lahderanta
Affiliation:
Wihuri Physical Laboratory University of Turku, FIN – 20014 Turku, Finland
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Abstract

We studied the transition of 8 nm-thick YBCO films deposited with and without YBaCuNbO buffer from the superconducting to resistive state due to the temperature or transport current increase. For both film types, the current –voltage characteristics and resistive transition followed the Kosterlitz-Thouless transition model. The superfluid densities were found from the Kosterlitz-Thouless transition temperature TKT to be about 3% and 1.3% of the total carrier density in YBCO with and without buffer, respectively. We believe that the low superfluid densities indicate the presence of weak links in the film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 659: Symposium II – High-Temperature Superconductors-Crystal Chemistry, Processing & Properties , 2000 , II6.5
Copyright
Copyright © Materials Research Society 2001

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References

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