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Flux Pinning and Weak Link Structure in Ca2Cu1O3 Doped LnBa2Cu3O7-y (Ln=La and Y)

Published online by Cambridge University Press:  28 February 2011

F. Mizuno ,
H. Masuda ,
I. Hirabayashi  and
S. Tanaka
F. Mizuno
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, ISTEC, 2–4–1, Mutsuno, Atsutaku, Nagoya 456, Japan
H. Masuda
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, ISTEC, 2–4–1, Mutsuno, Atsutaku, Nagoya 456, Japan
I. Hirabayashi
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, ISTEC, 2–4–1, Mutsuno, Atsutaku, Nagoya 456, Japan
S. Tanaka
Affiliation:
Superconductivity Research Laboratory, Nagoya Division, ISTEC, 2–4–1, Mutsuno, Atsutaku, Nagoya 456, Japan
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Abstract

Flux pinning and weak link structure were studied on the effect of Ca doping in LnBa2Cu3O7-y system (Ln=La and Y). The magnitude and the magnetic field dependence of the critical current density were improved by Ca doping. A small amount of impurity phase of such as Ca2Cu1O3 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 superconducting phases which have different transition temperature Tc and Tc'. The experimental result agrees well with the Ambegaokar-Baratoff theory for asymmetric Josephson junctions (S-I-S') in the temperature range of T < Tc' and with the proximity junction theory (S-N-S) in the range of Tc'<T<Tc.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 955
Copyright
Copyright © Materials Research Society 1990

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