Nondestructive determination of current–voltage characteristics of superconducting films by inductive critical current density measurements as a function of frequency

Yamasaki, Hirofumi; Mawatari, Yasunori; Nakagawa, Yoshihiko
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3275
Academic Journal
A nondestructive inductive method was developed to determine the current-voltage characteristics of superconducting films by measuring the critical current density J[SUBc] as a function of the frequency of ac magnetic fields. In well-known inductive methods that measure the J[SUBc] distribution of large-area films, J[SUBc] is measured at a frequency and the electric field E induced in the superconductor is proportional to the frequency; therefore, the E versus current density relation can be determined by measuring J[SUBc] at various frequencies. Current-voltage characteristics of YBa[SUB2]Cu[SUB3]O[SUB7] films measured by this method agree well with those determined by measuring magnetic-field-sweep rate dependence of magnetization.


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