Possibility of Horizontal Line Node in KFe$_2$As$_2$ Probed by Muon Spin Rotation

Details Possibility of Horizontal Line Node in KFe$_2$As$_2$ Probed by Muon Spin Rotation Possibility of Horizontal Line Node in KFe$_2$As$_2$ Probed by Muon Spin Rotation

2011-12-28

arxiv.org/abs/1112.6078v1

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

The anisotropy and temperature dependence of the magnetic field penetration depth in the iron-based superconductor KFe$_2$As$_2$ have been measured down to 20 mK by means of muon spin rotation. We have observed that the flux-line lattice forms triangular symmetry when we applied the field parallel to c-axis, suggesting the interaction between vortices should be isotropic. The temperature dependence of the penetration depth observd with an applied field parallel and perpendicular to c-axis are different. These results can be accounted for by a superconducting gap function with a horizontal line node in the basal plane.

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