Josephson Effect in Quasi One-dimensional Unconventional Superconductors

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

doi:10.1143/JPSJ.73.1922

Josephson Effect in Quasi One-dimensional Unconventional Superconductors

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

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	1922-1930
Number of pages	9
Journal	journal of the physical society of japan
Volume	73
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.73.1922
Publication status	Published - 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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title = "Josephson Effect in Quasi One-dimensional Unconventional Superconductors",

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.",

keywords = "low-temperature anomaly, organic superconductor, quarter-filling, quasi one-dimension, zero-energy states",

author = "Asano Yasuhiro and Tanaka Yukio and Tanuma Yasunari and Kuroki Kazuhiko and Tsuchiura Hiroki",

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T1 - Josephson Effect in Quasi One-dimensional Unconventional Superconductors

AU - Yasuhiro, Asano

AU - Yukio, Tanaka

AU - Yasunari, Tanuma

AU - Kazuhiko, Kuroki

AU - Hiroki, Tsuchiura

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

KW - low-temperature anomaly

KW - organic superconductor

KW - quarter-filling

KW - quasi one-dimension

KW - zero-energy states

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