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Diagnostics of the high-T/sub c/ superconductive films in a strong electromagnetic field

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1 Author(s)
Reznik, A.N. ; Inst. for Phys. of Microstructures, Acad. of Sci., Nizhny Novgorod, Russia

The method for diagnostics of the nonlinear properties of the high-T/sub c/ superconductive films is proposed. It employs the experimentally obtained nonlinear radiocharacteristics of a superconductive resonator and takes into account the inhomogeneous distribution of the nonlinear surface impedance, caused by inhomogencity of the RF-magnetic field amplitude along a film surface. The last circumstance leads to the integral equation for surface impedance of a superconductor. The proposed method is based on solution of the inverse problem of electrodynamics. The dependences of surface resistance on the RF-magnetic field amplitude, and relationships between precision of the method and a measurement error are obtained.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )