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Relationship between critical current properties and nanorod morphology in REBa2Cu3Oy thin films

Published online by Cambridge University Press:  11 December 2012

M. Haruta ,
N. Fujita ,
Y. Ogura ,
T. Nakata ,
T. Maeda ,
A. Ichinose ,
P. Mele ,
K. Matsumoto  and
S. Horii
M. Haruta
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
N. Fujita
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
Y. Ogura
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
T. Nakata
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
T. Maeda
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
A. Ichinose
Affiliation:
Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa 240-0196, Japan
P. Mele
Affiliation:
Institute for Sustainable Science and Development, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
K. Matsumoto
Affiliation:
Department of Materials Science and Engineering, Kyushu Institute of Technology, Tobata-ku, Kitakyushu 804-8550, Japan
S. Horii
Affiliation:
School of Environmental Science and Engineering, Kochi University of Technology, Kami-shi, Kochi 782-8502, Japan
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Abstract

Changes in critical current properties depending on growth temperature (T s) were clarified for Ba-Nb-O-doped YBa2Cu3Oy (Y123) films deposited by YAG- and excimer-PLD. Due to the introduction of Ba-Nb-O-nanorods, a vortex-Bose-glass-like behavior emerged as irreversibility lines and in-field critical current densities (J cs) were improved. Crossover magnetic fields (B cr) and in-field J cs increased with the increase in T s for the Y123 films with nanorods. These T s-dependent critical current properties were attributable to the changes in morphology of the nanorods with T s and were independent of laser source in PLD apparatuses. For the fabrication of RE123 coated conductors containing nanorods, optimization of T s with taking both materials of RE123 matrix and nanorod into account is necessary to achieve higher in-field J c.

Keywords

superconductingphysical vapor deposition (PVD)microstructure

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References

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