Topological Hysteresis in the Intermediate State of Type-I Superconductors

Details Topological Hysteresis in the Intermediate State of Type-I Superconductors Topological Hysteresis in the Intermediate State of Type-I Superconductors

2004-09-21

arxiv.org/abs/cond-mat/0409553v2

Phys. Rev. B 72, 212508(2005)

Physics

Condensed Matter

Superconductivity

4 pages, RevTex4

Scientific paper

10.1103/PhysRevB.72.212508

Magneto-optical imaging of thick stress-free lead samples reveals two distinct topologies of the intermediate state. Flux tubes are formed upon magnetic field penetration (closed topology) and laminar patterns appear upon flux exit (open topology). Two-dimensional distributions of shielding currents were obtained by applying an efficient inversion scheme. Quantitative analysis of the magnetic induction distribution and correlation with magnetization measurements indicate that observed topological differences between the two phases are responsible for experimentally observable magnetic hysteresis.

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