Magnetic mapping of defects in type-II superconductors

Recently, it was discovered that the non-uniform Meissner current flowing around the pinning sites in the type-II superconductor induces the unconventional vortex-antivortex pairs with the non-quantized magnetic flux [Ge et al., Nat. Commun. 6, 6573 (2015)]. Here, we provide the theory of this pheno...

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Bibliographic Details
Published in:Applied physics letters 2016-05, Vol.108 (21), p.212602 (1-4
Main Authors: Mironov, S., Devizorova, Zh, Clergerie, A., Buzdin, A.
Format: Article
Language:English
Subjects:
Applied physics
Condensed Matter
Defects
Magnetic fields
Magnetic flux
Perturbation
Physics
Superconductivity
Superconductors
Vortices
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Summary:Recently, it was discovered that the non-uniform Meissner current flowing around the pinning sites in the type-II superconductor induces the unconventional vortex-antivortex pairs with the non-quantized magnetic flux [Ge et al., Nat. Commun. 6, 6573 (2015)]. Here, we provide the theory of this phenomenon showing that the vortex-like structures originate from the perturbation of the current streamlines by the non-superconducting defect, which results in the generation of the localized magnetic field. The position and the shape of such vortex dipoles are shown to be very sensitive to the defect form. Thus, applying the external magnetic field or current to the superconductor and using, e.g., the high-resolution scanning Hall microscope to measure the stray magnetic field, one can plot the map containing the information about the position of the defects and their shape.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4952617