Abstract
We report investigations on the field modulated non resonant microwave absorption in the superconducting state of textured YBa2Cu3O7−x thin films. The temperature dependence of the modulated signal shows irregular structures below Tc which are shifted towards lower temperature with increasing the amplitude of the modulation field. The modulated signal shows, as a function of the applied field, a rather regular pattern of narrow lines. These results are ascribed to a distribution of weak intergrain Josephson links.
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