We have fabricated c-axis micro-bridges of La2-xSrxCuO4 (LSCO) single crystals in order to characterize the LSCO intrinsic Josephson junctions (IJJs). The current-voltage characteristics of the micro-bridges exhibited a large hysteresis with a voltage jump of the order 0.5-3 V and no multiple branching structures. A superconducting energy gap was clearly observed on the quasi-particle branch and showed BCS-like temperature dependence. In addition, the temperature dependence of the critical current of the IJJ was in good agreement with the theoretical curves for superconductor-insulator-superconductor (SIS) Josephson junctions. These results demonstrate that the IJJs of LSCO are characterized as stacked series SIS junctions.
- Intrinsic Josephson effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering