Josephson Effect in Quasi One-dimensional Unconventional Superconductors

Asano Yasuhiro, Tanaka Yukio, Tanuma Yasunari, Kuroki Kazuhiko, Tsuchiura Hiroki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 languageEnglish
Pages (from-to)1922-1930
Number of pages9
Journaljournal of the physical society of japan
Volume73
Issue number7
DOIs
Publication statusPublished - 2004

Keywords

  • low-temperature anomaly
  • organic superconductor
  • quarter-filling
  • quasi one-dimension
  • zero-energy states

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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