Why Is Meissner Effect Dependent on Field Intensity and Surface-to-Volume Ratio of Samples in Oxide Superconductors?
The Meissner curves were measured systematically under a wide range of magnetic fields for Ba2YCu3Oy and Bi2Sr2CaCu2Oy in the forms of single- and poly-crystalline and powder specimens. The Meissner fraction was smaller for single crystals than for powders. The poly-crystalline specimens exhibited the Meissner fraction similar to the single crystals under a low field while they did similar to the powder under a high field. Roughly speaking, the Meissner fraction decreases with the field but in a complex manner. A model has been proposed to systematically explain the observed behaviors based on the temperature dependent pinning force exerted on the flux expulsion.
KeywordsField Cool Flux Line Sintered Body Oxide Superconductor Meissner Effect
Unable to display preview. Download preview PDF.
- S.H. bloom, M.V. Kuric, Y.S. Yao, R.P. Guertin, D. Nichols, C. Jee, A. Kebede, J.E. Crow, T. Mihalisin, G.N. Myer and P. Shulottmann, “High-Temperature Superconductors”, Eds, M.B. Brodsky, R.C. Dynes, K. Kitazawa, H.L. Tuller, MRS (1988) p. 19Google Scholar
- L. Krusin-Elbaun, A.P. Malozemoff, Y. Yeshurun, D.C. Cronemeyer and F.Holtzberg, Physica C153–155, 1469 (1988).Google Scholar
- M. Motohira, K. Kuwahara, T. Hasegawa, K. Kishio, K. Kitazawa, Jpn. J. Cer. Soc. Int. Ed. in press.Google Scholar
- A. Celani, R. Messi, N. Sparvieri, S. Pace, A. Saggese, C. Giovannella, L. Fruchter, C. Chappert and I.A. Campbell, J. de Physique, to be published.Google Scholar
- K. Kitazawa, T. Matsushita, Y. Tomioka, 0. Tamura, I. Tanaka and H. Kojima, Jpn. J. Appl. Phys., to be submitted.Google Scholar