Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-14
Physics
Condensed Matter
Superconductivity
RevTeX, 8 pages, 8 figures. Minor changes in the text, added reference, more typos corrected
Scientific paper
We report measurements of the microwave complex resistivity at 48 GHz in SmBaCuO thin films. Measurements are performed with a moderate magnetic field, $\mu_{0}H<$ 0.8T, applied along the c-axis. We find that the complex resistivity presents clear sublinear field dependences, and that the imaginary part is remarkably sensitive to the moderate magnetic field. Interpretation considering an unusually strong pinning leads to very anomalous field dependences of the single-vortex viscosity and of the pinning constant. By contrast, allowing for a significant effect of the magnetic field on the depletion of the condensate, the data are quantitatively described by simple free-flux flow model, supplemented with two-fluid conductivity. In this frame, we obtain the vortex viscosity from the data. We compare vortex viscosity in SmBaCuO and in YBaCuO.
Boffa M.
Cucolo Anna Maria
Marcon Rogerio
Muzzi L.
Pompeo N.
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