Trapped Magnetic Flux in YBa2Cu3O7-δ Superconductors
Simultaneous measurements of the magnetic field dependence of the critical current density and the magnetization of yttrium barium cuprate superconductors have shown the presence of significant residual magnetic fluxes even in zero applied field. These can be sufficient to leave the material in the mixed state and hence can seriously influence the interpretation of the observed electrical and magnetic properties. This trapped flux appears to be associated with a magnetic field component threaded through the intergranular regions, whose motion is inhibited by circulating currents flowing in the granular system surrounding the field and preserved through the weak-link coupling. Once this coupling is destroyed, the field can move more freely.
KeywordsApplied Magnetic Field Lorentz Force Critical Current Density Transport Current Residual Voltage
Unable to display preview. Download preview PDF.
- 10.L. Lynds, F. Galasso, F. Otter, B.R. Weinberger, J. Budnick, D.P. Yang and M. Filipkowski. Comm. Am. Ceram. Soc. 71 C130 1988.Google Scholar
- 11.D.N. Matthews, T. Puzzer, A. Bailey, N. Moiulinos, G. Alvarez, G.R. Russell and K.N.R. Taylor. J. Crystal Growth, 1988. Accepted for publication.Google Scholar
- 14.A. Bailey, D.N. Matthews, K.N.R. Taylor, G.J. Russell and D.R. Misra. J. Mats. Sei. Letts. 1988. Submitted for publication.Google Scholar
- 15.D.N. Matthews, A. Bailey, G.J. Russell, G. Alvarez, S. Town, K.N.R. Taylor, F. Scott, M. McGirr and D.J.H. Corderoy. These proceedings.Google Scholar
- 16.D.N. Matthews, G.J. Russell, A. Bailey and K.N.R. Taylor. Nature. 1988. Submitted for publication.Google Scholar
- 18.H. Zijlstra. Experimental Methods of Magnetism (NH 1967), Vo. 2, p.103-Google Scholar
- 20.T. Finlayson. Private Communication.Google Scholar
- 21.E.J. Thomas, Type II Superconductivity [D. St. James, E.J. Thomas and G. Sarma], Pergamon 1969 pp.209-Google Scholar