An improved method for quantitative magneto-optical analysis of superconductors

• Published in: Superconductor science & technology Vol. 16; no. 1; pp. 71 - 79
• Main Authors: Laviano, F, Botta, D, Chiodoni, A, Gerbaldo, R, Ghigo, G, Gozzelino, L, Zannella, S, Mezzetti, E
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.01.2003
• ISSN: 0953-2048; 1361-6668
• DOI: 10.1088/0953-2048/16/1/313

Authors report on the analysis method to extract quantitative local electrodynamics in superconductors by means of the magneto-optical technique. First of all, authors discuss the calibration procedure to convert the local light intensity values into magnetic induction field distribution and start focusing on the role played by the generally disregarded magnetic induction components parallel to the indicator film plane (in-plane field effect). To account for the reliability of the whole technique, the method used to reconstruct the electrical current density distribution is reported, together with a numerical test example. The methodology is applied to measure local magnetic field and current distributions on a typical YBa2Cu3O7-x good quality film. Authors show how the in-plane field influences the MO measurements, after which authors present an algorithm to account for the in-plane field components. The impact of the correction on the experimental results is shown. Authors discuss some aspects about the electrodynamics of the superconducting sample. 21 refs.