Contact-free determination of the current-voltage law parameters for melt-textured YBCO superconductors in orthogonal magnetic fieldстатья
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Аннотация:A contact-free method to obtain the current-voltage characteristics (CVC) of hard superconductors by measuring the relaxation of the magnetization in a perpendicular magnetic field is developed. The relaxation curves obtained for melt-textured YBCO samples are well fitted by curves calculated within the electrodynamic model using a power-law CVC. This procedure uses only two fitting parameters, namely, the critical sheet current J(c) and the exponent tit of the power-law CVC. (c) 2006 Elsevier Ltd. All rights reserved.