Physics – Condensed Matter – Superconductivity
Scientific paper
2005-11-21
Physics
Condensed Matter
Superconductivity
to be published in Journal of Applied Physics
Scientific paper
10.1063/1.2142097
The critical current density of a superconducting film can be easily determined by an inductive and contactless method. Driving a sinusoidal current in a single coil placed in front of a superconducting sample, a non zero third harmonic voltage V_3 is induced in it when the sample goes beyond the Bean critical state. The onset of V_3 marks the value of current beyond which the sample response to the magnetic induction is no more linear. To take into account, in a realistic way, the magnetic coupling between the film and the coil we have developed a discrete model of the inducing and induced currents distribution. In the framework of this model the magnetic field profile on the sample surface and the coefficient linking the current flowing in the coil and the critical current density J_C of superconducting thin films is evaluated. The numerical results are checked measuring J_C of several thin films of YBa_2Cu_3O_(7-d) of known superconducting properties, used as a control material.
Andreone Antonello
Aurino M.
Gauzzi Andrea
Gennaro Emiliano Di
Iorio F. Di
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