Abstract
We investigated current–voltage ( I– V) properties of intrinsic Josephson junctions in c-axis micro-bridges (∼20 μm 2 area for ab plane and ∼1 μm length along the c-axis) of La 2− x Sr x CuO 4 single crystals. The micro-bridges were fabricated by the focused-ion-beam etching technique. We found periodic conductance peaks below the gap voltage in the RCSJ-like I– V curves of the intrinsic Josephson junctions. We discuss possible explanations and show that the subgap structures can be explained by coupling between ac Josephson oscillation and Josephson plasma oscillation in La 2− x Sr x CuO 4.
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