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Using electron spin resonance (ESR) technique we have obtained dataevidencing the existence of magnetic vortices in high-temperaturesuperconductors at temperatures above the critical one $T_c$. We have studiedmagnetic excitations in \bis single crystals above $T_c$ with the method ofsurface spin decoration. The surface layer of diphenyl-picrylhydrazyl was usedas a sensitive probe of magnetic field distortions. The temperature dependenceof the ESR signal parameters has indicated that far above $T_c$ the magneticflux of a sample is affected by the superconducting order parameterfluctuations while close to $T_c$ its changes are due to vortex-typeexcitations.

Vortex excitations above T_c as revealed by ESR