Abstract
Electron paramagnetic resonance and microwave absorption in thin films and bulk samples of RBa 2 Cu 3 O 7−δ (R = Y, Sm) is reported. A single line with g2.05 is observed at 300 K. Below T c , a strong low field absorption signal, peaked around 40 G in bulk samples and 300 G in thin films, appears accompanied with large fluctuations. The EPR signal is ascribed to Cu 2+ ions in non-superconducting regions and the low field one to flux penetration.
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