Evidences of vortex curvature and anisotropic pinning in superconducting films by quantitative magneto-optics

Abstract

We present the experimental observation of magnetic field line curvature at the surface of a superconducting film by local quantitative magneto-optics. In addition to the knowledge of the full induction field at the superconductor surface yielding the quantitative observation of the flux line curvature, our analysis method allows also local value measurements of the electrical current density inside the sample. Thus, we study the interplay between the electrodynamic constraints dictated by the film geometry and the pinning properties of the superconductor. In particular, we investigate the anisotropic vortex-pinning, due to columnar defects introduced by heavy ion irradiation, as revealed in the local current density dependence on the vortex curvature during magnetic flux diffusion inside the superconducting film.

12 pages, 11 figures, to be submitted to Phys. Rev. B

References in corpus (3)

• Critical State in Thin Anisotropic Superconductors of Arbitrary Shape
• Columnar defects acting as passive internal field detectors
• Theoretical model for magnetooptic imaging

Cited by in corpus (7)

• Advances in perturbative thermal field theory
• Evidence of rf-driven branching of dendritic vortex avalanches in MgB2 microwave resonators
• Anisotropic superconducting strip in an oblique magnetic field
• A new apparatus for deep patterning of beam sensitive targets by means of high-energy ion beam
• Microwave Nonlinearity and Photoresponse of Superconducting Resonators with Columnar Defect Micro-Channels
• Scaling laws for the critical current density in anisotropic biaxial superconductors
• Asymmetry of magnetic-field profiles in superconducting strips