Physics – Condensed Matter – Superconductivity
Scientific paper
2008-11-26
Phys. Rev. Lett. 102, 016403 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures. To be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.102.016403
We study the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of spin fluctuation mediated pairing, and focus on the effect of coexisting charge fluctuations. We find that (i) consecutive transitions from singlet pairing to FFLO and further to $S_z=1$ triplet pairing can generally take place upon increasing the magnetic field when strong charge fluctuations coexist with spin fluctuations, and (ii) the enhancement of the charge fluctuations lead to a significant increase of the parity mixing in the FFLO state, where the triplet/singlet component ratio in the gap function can be close to unity. We propose that such consecutive pairing state transition and strong parity mixing in the FFLO state may take place in a quasi-one-dimensional organic superconductor (TMTSF)$_2X$.
Aizawa Hirohito
Kuroki Kazuhiko
Tanaka Yukio
Yokoyama Takehito
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