Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by $μ$SR and SANS

Details Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by $μ$SR and SANS Transition from Type-I to Type-II Superconducting Behaviour with Temperature observed by $μ$SR and SANS

2003-05-26

arxiv.org/abs/cond-mat/0305595v1

Physics

Condensed Matter

Superconductivity

8 pages, 7 figures

Scientific paper

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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