THE rf RESISTIVITY OF A PERFORATED SUPERCONDUCTING FILM IN A MAGNETIC FIELD

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Abstract
We report measurements of the complex rf resistivity at 75 MHz as a function of temperature and magnetic field on an oxygen-doped aluminum film, perforated with a triangular lattice of holes. The rf response at commensurate magnetic fields is modeled in terms of coherent superimposition of vortex motion in a parabolic potential. Anomalously small dissipation is found for trapped quanta, owing to the absence of core excitations. The force constant of the pinning potential is found as a function of temperature

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