Vortex tilt modulus in Fulde-Ferrell-Larkin-Ovchinnikov state

Details Vortex tilt modulus in Fulde-Ferrell-Larkin-Ovchinnikov state Vortex tilt modulus in Fulde-Ferrell-Larkin-Ovchinnikov state

2006-10-28

arxiv.org/abs/cond-mat/0610796v4

Physics

Condensed Matter

Superconductivity

14 pages, 5 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.054517

Vortex tilt response in Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) vortex lattice is theoretically examined as a probe reflecting the spatial structure of this state. In the FFLO state with nodal planes perpendicular to the magnetic field in a quasi 2D material under a parallel field, the tilt modulus E_{2} {\it of the nodal planes} decreases as the paramagnetic effect is effectively enhanced, and this reduction of E_{2} in turn reduces the vortex tilt modulus. This reduction of vortex tilt modulus, more remarkable in more anisotropic systems, accompanying the FFLO transition may be an origin of the monotonous reduction of sound velocity detected upon cooling in a ultrasound measurement for CeCoIn5.

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