Critical currents, flux-creep activation energy and potential barriers for the vortex motion from the flux creep experiments

Details Critical currents, flux-creep activation energy and potential barriers for the vortex motion from the flux creep experiments Critical currents, flux-creep activation energy and potential barriers for the vortex motion from the flux creep experiments

2000-10-17

arxiv.org/abs/cond-mat/0010229v1

Phys. Rev. B 63, 184516 (2001)

Physics

Condensed Matter

Superconductivity

12 pages, 13 Postscript figures, Submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.63.184516

We present an experimental study of thermally activated flux creep in a superconducting ring-shaped epitaxial YBCO film as well as a new way of analyzing the experimental data. The measurements were made in a wide range of temperatures between 10 and 83 K. The upper temperature limit was dictated by our experimental technique and at low temperatures we were limited by a crossover to quantum tunneling of vortices. It is shown that the experimental data can very well be described by assuming a simple thermally activated hopping of vortices or vortex bundles over potential barriers, whereby the hopping flux objects remain the same for all currents and temperatures. The new procedure of data analysis also allows to establish the current and temperature dependencies of the flux-creep activation energy U, as well as the temperature dependence of the critical current Ic, from the flux-creep rates measured at different temperatures. The variation of the activation energy with current, U(I/Ic), is then used to reconstruct the profile of the potential barriers in real space.

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