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Electron paramagnetic resonance in ac dissipation was observed due to the Cooper pairs breaking up to their quasiparticle state. This phenomenon is the result of a flux motion on a pinning centers in high temperature superconducting materials. The detection of ac dissipation was performed in a low ac field (15 and 22 MHz) as well as in microwave range. Vortex motion hysteresis loop with magnetic field...
The profile of the magnetic field distribution over the surface of superconducting sample is studied by the scanning an electron paramagnetic resonance microprobe. The magnetic field distribution is mapped from the measurements of the spin probe EPR-signal shift.
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