Abstract
A response of a hollow YBa 2Cu 3O 7− δ ceramic superconducting cylinder (at a mixed state) to the 100 kHz frequency alternating field was investigated. It was found that the response is non-linear and contains the odd harmonics of the excitation frequency. The amplitudes of the first, third and fifth harmonics are measured depending on an alternating field value h⩽1 Oe, applied to the cylinder external surface, and on a stationary magnetic field H⩽500 Oe driving the sample to the mixed state. For the results analysis a theoretical model of the vortices non-linear oscillations is proposed based on a non-linear vortex–vortex and vortex–surface interaction.
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