Physics – Condensed Matter – Superconductivity
Scientific paper
2003-04-22
Physics
Condensed Matter
Superconductivity
accepted for publication in EPJB
Scientific paper
10.1140/epjb/e2003-00167-6
We report complex impedance measurements in an untwinned YBaCuO crystal. Our broad frequency range covers both the quasi static response and the resistive response of the vortex lattice. It allow us to characterize the irreversibility line without the need of any frequency dependent pinning parameters. We confirm the validity of the two modes model of vortex dynamic, and extract both the surface critical current and the flux flow resistivity around the first order transition $T_{m}$. This latter is identified by the abrupt loss of pinning and by an unexpected step of $\rho_{ff}(T)$ at $T_{m}$.
Andrzejewski B.
Daignere A.
Goupil Ch.
Pautrat Alain
Rykov Alexandre I.
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