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Contactless method for measuring the parameters of the current-voltage characteristic of YBCO superconductors in a perpendicular magnetic field |
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| Authors: | I F Voloshin A V Kalinov L M Fisher M L Nesterov V A Yampol’skii E H Brandt |
| Institution: | (1) All-Russia Electrical Engineering Institute, ul. Krasnokazarmennaya 12, Moscow, 111250, Russia;(2) Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, ul. Akademika Proskury 12, Kharkov, 61085, Ukraine;(3) Max Planck Institut für Metalloforschung, Heisenbergstrasse 1, Stuttgart, D-70506, Germany |
| Abstract: | A contactless method for determination of the parameters of the current-voltage (I—V) characteristic of hard superconductors by measuring the magnetization relaxation of the superconductor in a perpendicular magnetic field has been developed. The relaxation curves obtained for melt-textured YBCO samples are well approximated by the curves calculated within the electrodynamic model based on power-law I—V characteristics. This procedure uses only two fitting parameters: the critical current density J c and the exponent m of the I—V characteristic. |
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