The vortex depinning transition in untwinned YBaCuO using complex impedance measurements

Details The vortex depinning transition in untwinned YBaCuO using complex impedance measurements The vortex depinning transition in untwinned YBaCuO using complex impedance measurements

2003-12-10

arxiv.org/abs/cond-mat/0312251v1

Physics

Condensed Matter

Superconductivity

to be published in the proceedings of M2S RIO

Scientific paper

10.1016/j.physc.2004.03.034

We present surface impedance measurement of the vortex linear response in a large untwinned YBCO crystal. The depinning spectra obtained over a broad frequency range (100 Hz- 30 MHz) are those of a surface pinned vortex lattice with a free flux flow resistivity (two modes response). The critical current in the "Campbell" like regime and the flux flow resistivity in the dissipative regime are extracted. Those two parameters are affected by the first order transition, showing that this transition may be related to the electronic state of vortices.

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