Vortex excitations above T_c as revealed by ESR

Details Vortex excitations above T_c as revealed by ESR Vortex excitations above T_c as revealed by ESR

2010-02-04

arxiv.org/abs/1002.1029v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, submitted to Phys. Rev. B

Scientific paper

Using electron spin resonance (ESR) technique we have obtained data evidencing the existence of magnetic vortices in high-temperature superconductors at temperatures above the critical one $T_c$. We have studied magnetic excitations in \bis single crystals above $T_c$ with the method of surface spin decoration. The surface layer of diphenyl-picrylhydrazyl was used as a sensitive probe of magnetic field distortions. The temperature dependence of the ESR signal parameters has indicated that far above $T_c$ the magnetic flux of a sample is affected by the superconducting order parameter fluctuations while close to $T_c$ its changes are due to vortex-type excitations.

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