TY - JOUR
T1 - Josephson Effect in Quasi One-dimensional Unconventional Superconductors
AU - Yasuhiro, Asano
AU - Yukio, Tanaka
AU - Yasunari, Tanuma
AU - Kazuhiko, Kuroki
AU - Hiroki, Tsuchiura
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
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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U2 - 10.1143/JPSJ.73.1922
DO - 10.1143/JPSJ.73.1922
M3 - Article
AN - SCOPUS:85024467122
VL - 73
SP - 1922
EP - 1930
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
ER -