Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by μSR and SANS
Aegerter, C. M. · Keller, H. · Lee, S. L. · Ager, C. · Ogrin, F. Y. · Cubitt, R. · Forgan, E. M. · Nutall, W. J. · Kealey, P. G. · Lloyd, S. H. · Johnson, S. T. · Riseman, T. M. · Nutley, M. P.
Original · EN
We investigate the superconducting behaviour of Bi doped Pb. Pure lead shows type-I behaviour entering an intermediate state in a magnetic field. High dopings of Bi (>3%) lead to type-II behaviour showing a mixed state, where the magnetic field penetrates the superconductor in the form of a flux lattice. At intermediate doping, the sample shows both type-I and type-II behaviour depending on the temperature. This arises because the Ginzburg-Landau parameter κ passes through its critical value of 1/√2 with temperature.
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