Anisotropic vortex lattice structures in the FeSe superconductor

Details Anisotropic vortex lattice structures in the FeSe superconductor Anisotropic vortex lattice structures in the FeSe superconductor

2011-09-28

arxiv.org/abs/1109.6116v3

Phys. Rev. B 85, 104510 (2012)

Physics

Condensed Matter

Superconductivity

9 pages

Scientific paper

10.1103/PhysRevB.85.104510

In the recent work by Song et al. [Science 332, 1410 (2011)], the scanning tunneling spectroscopy experiment in the stoichiometric FeSe reveals evidence for nodal superconductivity and strong anisotropy. The nodal structure can be explained with the extended s-wave pairing structure with the mixture of the $s_{x^2+y^2}$ and $s_{x^2y^2}$ pairing symmetries. We calculate the anisotropic vortex structure by using the self-consistent Bogoliubov-de Gennes mean-field theory. In considering the absence of magnetic ordering in the FeSe at the ambient pressure, orbital ordering is introduced, which breaks the $C_4$ lattice symmetry down to $C_2$, to explain the anisotropy in the vortex tunneling spectra.

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