Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-04
Physics
Condensed Matter
Superconductivity
9 pages with 7 figures
Scientific paper
10.1103/PhysRevB.72.064506
We analyze the magnetic-field profiles H_z(x) at the upper (lower) surface of a superconducting strip in an external magnetic field, with z perpendicular to the plane of the strip and x along its width. The external magnetic field H_a is perpendicular or inclined to the plane of the strip. We show that an asymmetry of the profiles H_z(x) appears in an oblique magnetic field H_a and also in the case when the angular dependence of the critical current density j_c in the superconductor is not symmetric relative to the z axis. The asymmetry of the profiles is related to the difference \Delta H_z(x) of the magnetic fields at the upper and lower surfaces of the strip, which we calculate. Measurement of this difference or, equivalently, of the asymmetry of the profiles can be used as a new tool for investigation of flux-line pinning in superconductors.
Brandt Ernst Helmut
Mikitik Grigorii P.
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