Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by μSR and SANS
C. M. Aegerter, H. Keller, S. L. Lee, C. Ager, F. Y. Ogrin, R. Cubitt, E. M. Forgan, W. J. Nutall, P. G. Kealey, S. H. Lloyd, S. T. Johnson, T. M. Riseman, M. P. Nutley
Abstract
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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