Physics – Condensed Matter – Superconductivity
Scientific paper
2006-01-11
Phys. Rev. Lett. 97, 187002 (2006)
Physics
Condensed Matter
Superconductivity
4+ pages, 4 figures
Scientific paper
10.1103/PhysRevLett.97.187002
This Letter theoretically discusses quasiparticle states and nuclear spin relaxation rates $T_1^{-1}$ in a quasi-one-dimensional superconductor (TMTSF)$_2$PF$_6$ under a magnetic field applied parallel to the conduction chains. We study the effects of Josephson-type vortices on $T_1^{-1}$ by solving the Bogoliubov de Gennes equation for $p$-, $d$- or $f$-wave pairing interactions. In the presence of line nodes in pairing functions, $T_1^{-1}$ is proportional to $T$ in sufficiently low temperatures because quasiparticles induced by vortices at the Fermi energy relax spins. We also try to identify the pairing symmetry of (TMTSF)$_2$PF$_6$.
Asano Yasuhiro
Ichioka Masanori
Kuroki Kazuhiko
Takigawa Mitsuaki
Tanaka Yukio
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