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Control of Y2O3 nano-islands density to introduce artificial pinning centers in YBCO thin films

Published online by Cambridge University Press:  01 February 2011

P. Mele ,
K. Matsumoto ,
T. Horide ,
O. Miura ,
A. Ichinose ,
M. Mukaida ,
Y. Yoshida  and
S. Horii
P. Mele
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan INFM and DCCI, Genova University, Via Dodecaneso 31, 15165 Genova,Italy CREST-JST, Saitama 332-0012, Japan
K. Matsumoto
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan CREST-JST, Saitama 332-0012, Japan
T. Horide
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan CREST-JST, Saitama 332-0012, Japan
O. Miura
Affiliation:
Department of Electrical Engineering, Tokyo Metropolitan University, Tokyo 192-0364, Japan CREST-JST, Saitama 332-0012, Japan
A. Ichinose
Affiliation:
CRIEPI, 2-6-1 Nagasaka, Yokosuka 240-0196, Japan CREST-JST, Saitama 332-0012, Japan
M. Mukaida
Affiliation:
Yamagata University, Yamagata 992-8510, Japan CREST-JST, Saitama 332-0012, Japan
Y. Yoshida
Affiliation:
Nagoya University, Nagoya 464-8603, Japan CREST-JST, Saitama 332-0012, Japan
S. Horii
Affiliation:
University of Tokyo, Tokyo 113-8656, Japan CREST-JST, Saitama 332-0012, Japan
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Abstract

We successfully introduced high-density linear defects as artificial pinning centers (APCs) of the quantized vortices into YBCO films, during the film deposition procedure. APCs were introduced perpendicular to the film surface by using the distributed nano-sized Y2O3 islands prepared on SrTiO3(100) substrates. It is possible to induce strong changes on the shape and density of the Y2O3 islands by varying the deposition and annealing conditions. The highest Y2O3 islands density, 226/μm2, was obtained with fifteen laser pulses at 800°C of substrate temperature, and applying an annealing temperature of 800°C. Even if only a small fraction of the induced defects act as effective pinning centers, Jc of YBCO film grown on the Y2O3 nanoislands/SrTiO3 substrate increased to 1.8 107 A/cm2 (20 K, B//c, 0 T), which is 1.5 times higher than that of the pure YBCO film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 868: Symposium C – Recent Advances in Superconductivity - Materials Synthesis, Multiscale Characterization and Functionally Layered Composite Conductors , 2005 , C8.14
Copyright
Copyright © Materials Research Society 2005

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