Microwave vortex dynamics in Tl-2212 thin films

Details Microwave vortex dynamics in Tl-2212 thin films Microwave vortex dynamics in Tl-2212 thin films

2007-10-18

arxiv.org/abs/0710.3488v1

Physics

Condensed Matter

Superconductivity

pdfTeX, 4 pages, 3 figures, VORTEX 2007 proceedings, to appear in Physica C

Scientific paper

10.1016/j.physc.2007.11.063

We present measurements of the effective surface impedance changes due to a static magnetic field, $\Delta Z(H,T)=\Delta R(H,T)+\rmi \Delta X(H,T)$, in a Tl-2212 thin film with $T_c>$ 103 K, grown on a CeO$_2$ buffered sapphire substrate. Measurements were performed through a dielectric resonator operating at 47.7 GHz, for temperatures 60 K$\leq T\Delta R(H)$ in almost the whole $(H,T)$ range explored. A careful analysis of the data allows for an interpretation of these results as dominated by vortex dynamics. In the intermediate-high field range we extract the main vortex parameters by resorting to standard high frequency model and by taking into proper account the creep contribution. The pinning constant shows a marked decrease with the field which can be interpreted in terms of flux lines softening associated to an incipient layer decoupling. Small vortex viscosity, by an order of magnitude lower than in Y-123 are found. Some speculations about these findings are provided.

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