Penetration depths of high Tc films measured by two-coil mutual inductances

Fiory, A. T.; Hebard, A. F.; Mankiewich, P. M.; Howard, R. E.
June 1988
Applied Physics Letters;6/20/1988, Vol. 52 Issue 25, p2165
Academic Journal
A fundamental parameter of sample quality in epitaxial films of high Tc oxides is the effective penetration depth λ|| of the superconducting sheet. A contactless audio-frequency method is described, in which an epitaxial YBa2Cu3O7 film is sandwiched between sets of stacked coils, and the procedure is given for computing the complex sheet impedance and hence λ|| from the change in mutual inductance produced by screening currents in the film. Temperature dependence of the complex impedance is presented.


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