Nonlinear inductive response of high temperature superconducting films measured by the mutual inductance technique
Abstract
The dependence of the penetration depth λ on current densityJ in an unpatterned superconducting film can be measured with a pair of small coaxial coils positioned on opposite sides of the film. Mutual inductancemeasurements in this configuration with a direct-current (dc) current component in one of the coils provide a means to determine λ(J). It is possible to separate out the effects of heating by initially trapping a persistent current in the film. The nonlinear (current-dependent) coefficients of λ(J) measured by this “dc” technique agree well with those measured by third harmonic generation in coplanar waveguide transmission lines at 5 GHz. This nondestructure technique could be used to screen films before incorporating them into circuits sensitive to nonlinear effects.
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270975
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Article ID:
270975
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10.1063/1.123248
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Scimatic Chain (ID: 481)
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