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Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by μSR and SANS

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arxiv cond-mat/0305595 v1 pith:TMVNMFPU submitted 2003-05-26 cond-mat.supr-con

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
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P.G. Kealey S.H. Lloyd S.T. Johnson T.M. Riseman M.P.Nutley
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classification cond-mat.supr-con
keywords behaviourtemperaturetype-itype-iifieldintermediateleadmagnetic
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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 $\kappa$ passes through its critical value of $1/\sqrt{2}$ with temperature.

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