Flux Pinning and Weak Link Structure in Ca-Doped LaBa_2Cu_3O_<7-y>
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概要
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The effect of Ca doping on the flux pinning and the weak link structure of the LaBa_2Cu_3O_<7-y> system have been studied. The magnitude and the magnetic field dependence of the critical current density were improved by Ca doping. A small amount of impurity phases of Ca-related compounds such as Ca_2Cu_1O_3 and Ca_1Cu_2O_3 may work as a desirable flux pinning center. Moreover, it was found that the current-temperature characteristics for Ca-doped samples showed the evidence of two kinds of superconductor phases which have different transition temperatures T_c and T'_c. The experimental result agreed well with the Ambegaokar-Baratoff theory for asymmetric Josephson junctions (S-I-S') in the temperature range of T<T'_c and with the proximity junction theory (S-N-S) in the range of T'_c<T<T_c.
- 社団法人応用物理学会の論文
- 1989-07-20
著者
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TANAKA Shoji
Superconductivity Research Laboratory, International Superconductivity Technology Center
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Masuda Hideki
Ogawa & Co. Ltd. Material R&d Laboratory
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Hirabayashi Izumi
Superconductivity Research Laboratory, ISTEC
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MIZUNO Fumio
Superconductivity Research Laboratory,Nagoya Division,International Superconductivity Technology Cen
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MASUDA Hiromu
Superconductivity Research Laboratory,Nagoya Division,International Superconductivity Technology Cen
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Mizuno Fumio
Superconductivity Research Laboratory Nagoya Division International Superconductivity Technology Cen
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Hirabayashi I
Superconductivity Research Laboratory International Superconductivity Technology Center
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Hirabayashi Izumi
Superconductivity Research Laboratory International Superconductivity Technology Center
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Tanaka Shoji
Superconductivity Research Laboratory International Superconductivity Technology Center
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Hirabayashi Izumi
Superconductivity Research Laboratory (SRL), International Superconductivity Technology Center (ISTEC), 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan
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