Nematic order in the vicinity of a vortex in superconducting FeSe

Details Nematic order in the vicinity of a vortex in superconducting FeSe Nematic order in the vicinity of a vortex in superconducting FeSe

2011-09-12

arxiv.org/abs/1109.2600v3

Phys. Rev. B 84, 205113 (2011)

Physics

Condensed Matter

Superconductivity

23 pages, 6 figures; (v2) slightly modified title, added references; (v3) published version

Scientific paper

10.1103/PhysRevB.84.205113

We present a phenomenological theory of the interplay between nematic order and superconductivity in the vicinity of a vortex induced by an applied magnetic field. Nematic order can be strongly enhanced in the vortex core. As a result, the vortex cores become elliptical in shape. For the case where there is weak bulk nematic order at zero magnetic field, the field-induced eccentricity of the vortex core has a slow power-law decay away from the core. Conversely, if the nematic order is field-induced, then the eccentricity is confined to the vortex core. We discuss the relevance of our results to recent scanning tunnelling microscopy experiments on FeSe (Song et al., Science 332, 1410 (2011)).

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