Hostname: page-component-745bb68f8f-b6zl4 Total loading time: 0 Render date: 2025-02-10T21:06:07.141Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Tinkham, M. and Lobb, C. J., in Solid State Physics, edited by Seitz, F., Turnbull, D., and Ehrenreich, E. (Academic, New York, 1989) pp.91–103.Google Scholar
2 Masuda, H., Mizuno, F., Hirabayashi, I., and Tanaka, S., Jpn. J. Appl. Phys. 28, L1226 (1989)Google Scholar
3 Takita, K., Kato, H., Akinaga, H., Asano, H. (private communication)Google Scholar
4 Bean, C. P., Phys. Rev. Lett. 8, 250 (1962)Google Scholar
5 Okai, B., Kosuge, M., Takahashi, K., and Ohta, M., Jpn. J. Appl. Phys. 27, L1843 (1988)Google Scholar
6 Shi, D., Boley, M. S., Welp, U., Chen, J. G., and Liao, Y., Phys. Rev. B40, 5255 (1989)Google Scholar
7 Ambegaokar, V. and Baratoff, A., Phys. Rev. Lett. 10, 486 (1963)Google Scholar
8 Kulik, I. O. and Omely'anchuk, A. N., Sov. J. Low Temp. Phys. 3, 419 (1980)Google Scholar
9 Ohta, H., Takahata, M., Yaraada, Y., and Takahashi, Y., Proc. 18 th. Int. Conf. on Low Temperature Physics, Kyoto,1987, Jpn. J. Appl. Phys. 26, suppl. 26–3, 1613 (1987)Google Scholar
10 de Gennes, P. G., Rev. Mod. Phys. 36, 226 (1964)Google Scholar
11 Mühlschlegel, B., Z. Phys. 155, 313 (1959)Google Scholar
12 Romagnan, J. P., Gilabert, A., and Noiray, J. C., Solid State Coramu. 14, 83 (1974)Google Scholar
13 Zandbergen, H. W., Fu, W. T., and de Jongh, L. J., Physica C 156, 307 (1988)Google Scholar