Josephson effect in junctions of quasi one-dimensional organic superconductors (TMTSF)2X is discussed. We assume the quarter-filling electron band and p, d and f wave like pairing symmetries in superconductors. To realize the electronic structures in real materials, we introduce the asymmetric hopping integral (t′) between second nearest lattice sites. For t′=0, the Josephson current in the d wave symmetry saturates in low temperatures, whereas those in p and f wave symmetries show the low-temperature anomaly due to the zero-energy state (ZES) at the junction interface. The low-temperature anomaly appears even in the d wave symmetry in the presence of t′, whereas the anomaly is suppressed in the f wave symmetry.
- Low-temperature anomaly
- Zero-energy states