Staircase penetration of magnetic flux into a superconducting flat ring

Leonid Burlachkov; Nikita Fuzailov

doi:10.1103/PhysRevB.107.224519

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Staircase penetration of magnetic flux into a superconducting flat ring

Leonid Burlachkov, Nikita Fuzailov

DOI 10.1103/PhysRevB.107.224519 · Physical Review B

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Abstract

We analyzed the distribution of the Meissner shielding currents in a flat superconducting ring and quantitatively described the penetration of magnetic avalanches (dendrites) inside it. Using a recurrent procedure, the external field Hext, in which a perforating (edge to edge crossing) avalanche appears, is calculated. A staircase dependence of the mean field trapped inside a ring, 〈H〉 vs Hext, is comprehensively described. A staircase slope appears to be a universal function of a ring shape (inner to outer diameter ratio). The heat released by a penetrating dendrite grows linearly with each next perforation. Flux pinning, if present, modifies a staircase dependence and makes steps smaller, but does not change the staircase slope. Our theoretical results are in a good accordance with the experimental data.