Abstract
The temperature dependence of the critical current density at high temperatures and in weak applied magnetic field for YBa2Cu3O7−y ceramic samples with a pronounced granular character is analyzed. The experimental results can be explained in terms of thermally activated motion of the intergrain Josephson vortices at grain boundaries, which may be an indication that the actual limiting factor for the critical current density in ceramic samples results from a weak pinning force density for the intergrain vortices rather than from the weak-link quenching.
Similar content being viewed by others
References
J. F. Kwak, E. L. Venturini, P. J. Nigrey, and D. S. Ginley,Phys. Rev. B 37, 9749 (1988).
R. L. Peterson and J. W. Ekin,Phys. Rev. B 37, 9848 (1988).
D. P. Hampshire, X. Cai, J. Seutjens, and D. C. Larbalestier,Supercond. Sci. Technol. 1, 12 (1988).
J. R. Thompson, J. Brynestad, D. M. Kroeger, Y. C. Kim, S. T. Sekula, D. K. Christen, and E. D. Specht,Phys. Rev. B 39, 6652 (1989).
J. E. Evetts and B. A. Glovacki,Cryogenics 28, 641 (1988).
H. Dersch and G. Blatter,Phys. Rev. B 38, 11391 (1988).
D. C. Larbalestier, M. Daeumling, X. Cai, J. Seutjens, J. McKinell, D. P. Hampshire, P. Lee, C. Meingast, T. Willis, H. Muller, R. D. Ray, R. G. Dillenburg, E. E. Hellstrom, and R. Joint,J. Appl. Phys. 62, 3308 (1987).
L. Miu, Proc. of the Int. Seminar on High-T c Supercond., Dubna, 28 June to 1 July 1989, in press.
L. Miu, G. Aldica, E. Cruceanu, and V. Teodorescu,J. Mater. Sci. Lett., in press.
L. Miu, S. Popa, M. Popescu, and E. Pavel,Z. Phys. B 70, 421 (1988).
J. R. Clem,Physica C 153–155, 50 (1988).
M. A. Dubson, S. T. Herbert, J. J. Calabrese, D. C. Harris, B. R. Patton, and J. C. Garland,Phys. Rev. Lett. 60, 1061 (1988).
P. W. Anderson,Phys. Rev. Lett. 9, 309 (1962).
L. Miu and S. Popa,J. Low Temp. Phys. 42, 203 (1981).
A. M. Campbell and J. E. Evetts,Adv. Phys. 21, 199 (1972).
Y. Yeshurun and A. P. Malozemoff,Phys. Rev. Lett. 60, 2202 (1988).
M. Tinkham,Phys. Rev. Lett. 61, 1658 (1988).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Miu, L., Crisan, A., Popa, S. et al. On the limiting factors of the critical current density in high-T c superconducting ceramics. J Supercond 3, 391–394 (1990). https://doi.org/10.1007/BF00617464
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00617464