Abstract
We present an experimental study of flux creep in YBCO film. A ring-shaped film was used to directly obtain voltage-current characteristics of the film in a flux creep regime. It is shown that the flux creep can be described in terms of quantum tunneling of vortices up to temperatures of 10–15 K. We have also investigated the influence of weak illumination on flux creep rate. It is shown that visible light with intensity less than 1 mW/cm 2 drastically accelerates the flux creep at liquid helium temperatures. The influence of light is completely different to that caused by the temperature rise. We propose a simple qualitative model to explain the high sensitivity of the flux creep to weak illumination.
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