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The vortex depinning transition in untwinned YBaCuO using complex impedance measurements

Alain Pautrat·Christophe Goupil·Charles Simon·Bart Andrewjewski·A. I. Rykov·S. Tajima
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Abstract

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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Alain Pautrat, Christophe Goupil, Charles Simon, Bart Andrewjewski, A. I. Rykov, S. Tajima. 2003-12-10. The vortex depinning transition in untwinned YBaCuO using complex impedance measurements. https://doi.org/10.1016/j.physc.2004.03.034

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