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Peculiarities of the vortex dynamics in YBa2Cu3Ox single crystals as revealed by irreversible microwave absorption
Authors:T. Shaposhnikova   Yu. Vashakidze   R. Khasanov  Yu. Talanov
Affiliation:

Institute for Technical Physics, Kazan 420029, Russian Federation

Abstract:We report the results of a wide experimental study of the irreversible modulated microwave absorption as a function of temperature, applied magnetic field and modulation amplitude in the YBa2Cu3Ox single crystals. To analyze the experimental data the model of the microwave power dissipation by the flux lines has been developed taking into account thermal fluctuations, the distributions of currents and vortices over a sample. We have obtained the information about regimes of vortex motion in the different areas of the HT phase diagram and estimated the values of flux flow viscosity and critical current density.
Keywords:Oxide superconductors   Single crystals   Electromagnetic wave absorption   Thermal effects   Magnetic field effects   Electric current distribution   Phase diagrams   Critical current density (superconductivity)   Yttrium compounds   Microwave absorption   Thermal fluctuations
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