J. Phys. IV France 09 (1999) Pr10-293-Pr10-295
Square vortex lattice in p-wave superconductorsJ. Shiraishi1 and K. Maki2
1 Graduate School of Mathematical Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8914, Japan
2 Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, U.S.A.
Making use of the Ginzburg Landau equation for isotropic p-wave superconductors, we construct the single vortex solution in part analytically. The fourfold symmetry breaking term arising from the tetragonal symmetry distortion of the Fermi surface is crucial, since this term indicates a fourfold distortion of the vortex core somewhat similar to the one found in d-wave superconductors. This fourfold distortion of the vortex core in turn favors the square vortex lattice as observed recently by small angle neutron scattering (SANS) experiment from Sr2RuO4. We find that the hexagonal vortex lattice at H = Hc1 transforms into the square one for H = Hcr = 0.26-Hc2. On the other hand the SANS data does not reveal such transition. The square vortex covers everywhere studied by the SANS implying Hcr is very close to Hc1. Therefore some improvement in the present model is certainly desirable.
© EDP Sciences 1999