EPR Effect in Magnetic Dependent Dissipation in High Temperature Superconductors |
| J.Stankowski
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland |
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| Received: 24 04 2005; |
| 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 modulation of 15 Hz was recorded. Besides V-shaped dependence of ac power dissipation P(B), a direct electron paramagnetic resonance signal related to Cooper pairs→ quasiparticle fluctuation was observed. |
| DOI: 10.12693/APhysPolA.108.243 PACS numbers:74.72.-h, 76.30.-v |