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Induced Currents in Close-Ended Type-II Superconducting Coils

The electrical properties of a close-ended coil made of REBCO-coated conductor wire are studied via the measurement of its induced currents upon exposure to a sinusoidal magnetic field at different frequency. Results show a similarity to the behavior of currents inside an RLC circuit where the peak amplitude is dependent on the contact resistance of the solder joining the two ends of the coil and the resonant frequency, i.e., a function of the inductance of the coil and penetration rate of fluxons into the superconducting layers. Our findings suggest highly feasible applications stemming from such experimental setup in the field of linear and rotating machinery and low-frequency high-quality-factor resonators.