Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-22
J. Phys. Soc. Jpn. 77, 064711 (2008)
Physics
Condensed Matter
Superconductivity
9 pages, 15 figures, 1 table
Scientific paper
10.1143/JPSJ.77.064711
We study Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of superconductors with and without inversion symmetry based on the Hubbard model on the square lattice near half-filling, using the random phase approximation. We show that center of mass momentum $Q$ tends to be parallel to $x$- or y-axis in the presence of inversion symmetry, while $Q$ vector is likely to be perpendicular to the magnetic field in the absence of inversion symmetry. We also clarify that $d+f$-wave pairing is favored and the hetero spin triplet $f$-wave state is present in the FFLO state unlike state in the superconductors only with the Rashba type spin-orbit coupling (RSOC) originating from the broken inversion symmetry. The triplet $f$-wave state is enhanced by magnetic field and the RSOC. This stems from the reduction of the spin susceptibilities by the magnetic field and the RSOC.
Onari Seiichiro
Tanaka Yukio
Yokoyama Takehito
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