Physics – Condensed Matter – Superconductivity
Scientific paper
2009-04-20
J . Phys. Soc. Jpn. 79, 034702 (2010)
Physics
Condensed Matter
Superconductivity
12 pages, 11 figures. High-resolution figures will be available in published version
Scientific paper
We investigate pairing symmetry in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) vortex state and vortex lattice, and explain the electronic structure in these states in terms of pairing symmetry. We show analytically that at the intersection point of FFLO nodal plane and vortex line, only even frequency pairing is present if the Zeeman splitting is negligibly small. With increasing Zeeman splitting, odd frequency pairing emerges there. This makes it possible to interpret the gap structure of the density of states at the intersection point as a manifestation of the even frequency pairing. In the vortex lattice, we find that only odd frequency pairing is present at the core centers, while at the midpoint of the vortex lines, only even frequency pairing exists. Thus, the odd and even frequency pairings also form the lattice in the vortex lattice state.
Ichioka Masanori
Tanaka Yukio
Yokoyama Takehito
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