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Spatiotemporal vortex matter oscillations in Bi2Sr2CaCu2O8+delta crystals
B Kalisky1, M Gitterman, B Ya Shapiro
1Institute for Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan, Israel. beena.kalisky@weizmann.ac.il
Abstract:
We observed an oscillatory behavior, both in space and time, of the induction in Bi2Sr2CaCu2O8+delta crystals exposed to a steady magnetic field. This new "flux waves" phenomenon appears near the order-disorder vortex phase transition, under specific conditions of temperature and induction gradient. A theoretical description of this effect is based on two coupled equations: the Landau-Khalatnikov dynamic equation for the order parameter of the vortex phase transition and the diffusion equation for the time evolution of the magnetic induction. A linear stability analysis of these equations predicts an oscillatory instability characterized by a period and wavelength in accordance with the experimental results.
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