Flux-pinning mechanism in Fe- and Ni-doped YBa2Cu3O7-δ
- 1 October 1989
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 2 (4) , 207-211
- https://doi.org/10.1088/0953-2048/2/4/001
Abstract
The intragranular pinning properties of polycrystalline YBa2(Cu1-xMx)3O7- delta with M=Fe, Ni and 0p is related to the onset of dissipative flux flow within weak pinning channels in the superconductor. A quantitative analysis of the data yields a channel width comparable with the flux-line spacing a0. This indicates that single rows of flux lines seem to move once the Lorentz force exceeds the flow stress of the flux-line lattice. Experimental evidence is given that the pinning of the flux lines outside the channels cannot be caused by twin boundaries.Keywords
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