Abstract
Josephson effect in junctions of quasi one-dimensional superconductors at the quarter-filling electron density is discussed by using the tight-binding model on a two-dimensional square lattice. To consider the triangular lattice structures in real materials such as (TMTSF)2X (X = PF6, ClO4, etc), the asymmetric hopping integral is introduced among second nearest lattice sites. A combination of these characters in superconductors (quasi one-dimensionality, quarter-filling electron density and weak triangular lattice structures) seriously affects the formation of a zero-energy state at a junction interface. As a consequence, calculated results of the Josephson current show anomalous dependences on temperatures.
Original language | English |
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Pages (from-to) | 1922-1930 |
Number of pages | 9 |
Journal | journal of the physical society of japan |
Volume | 73 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |
Keywords
- low-temperature anomaly
- organic superconductor
- quarter-filling
- quasi one-dimension
- zero-energy states
ASJC Scopus subject areas
- Physics and Astronomy(all)