Topological Hysteresis in the Intermediate State of Type-I Superconductors

Abstract

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.

arXiv comment4 pages, RevTex4

References in corpus (3)

• Meissner - London state in superconductors of rectangular cross-section in perpendicular magnetic field
• The Shapes of Flux Domains in the Intermediate State of Type-I Superconductors
• Impeded Growth of Magnetic Flux Bubbles in the Intermediate State Pattern of Type I Superconductors

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