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Abstract
The resistive voltage near the critical current in the mixed state of superconducting niobium foils has been measured in the presence of small oscillatory magnetic fields oriented parallel to the static magnetic field and perpendicular to the foil. The oscillatory field was found to cause an enhancement in the resistive voltage which depends on frequency and amplitude of the oscillatory field. The voltage increments show a maximum at a frequency ω* which varies with the static magnetic field and the specimen thickness and which depends very little on the lateral sample dimensions and the amplitude of the oscillatory field. The results are discussed in terms of eddy-current damping within the superconductor of an external magnetic field variation.
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