https://doi.org/10.1140/epjb/e2003-00167-6
Electrodynamics of the vortex lattice in untwinned YBaCuO by complex impedance measurements
1
CRISMAT/ISMRA (UMR 6508 associée au CNRS) , boulevard du Maréchal Juin, 14050 Caen Cédex, France
2
Institute of molecular physics, Smoluchowskiego 17, Poznan, Poland
3
Superconductivity Research Laboratory, ISTEC, Tokyo 135, Japan
Corresponding author: a alain.pautrat@ismra.fr
Received:
22
November
2002
Revised:
17
February
2003
Published online:
20
June
2003
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 Tm. This latter is identified by the
abrupt loss of pinning and by an unexpected step of 
at Tm.
PACS: 74.72.Bk – Y-based cuprates / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
