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

Kazuki Ohishi; Yasuyuki Ishii; Hedeto Fukazawa; Taku Saito; Isao Watanabe; Yoh Kohori; Takao Suzuki; Kunihiro Kihou; Chul-Ho Lee; Kiichi Miyazawa; Hijiri Kito; Akira Iyo; Hiroshi Eisaki

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

Superconductivity 2011-12-30 v1

Authors: Kazuki Ohishi , Yasuyuki Ishii , Hedeto Fukazawa , Taku Saito , Isao Watanabe , Yoh Kohori , Takao Suzuki , Kunihiro Kihou , Chul-Ho Lee , Kiichi Miyazawa , Hijiri Kito , Akira Iyo , Hiroshi Eisaki

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Abstract

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.

Keywords

iron-based superconductor kfe2as2 muon spin rotation penetration depth horizontal line node superconducting gap

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@article{arxiv.1112.6078,
  title  = {Possibility of Horizontal Line Node in KFe$_2$As$_2$ Probed by Muon Spin Rotation},
  author = {Kazuki Ohishi and Yasuyuki Ishii and Hedeto Fukazawa and Taku Saito and Isao Watanabe and Yoh Kohori and Takao Suzuki and Kunihiro Kihou and Chul-Ho Lee and Kiichi Miyazawa and Hijiri Kito and Akira Iyo and Hiroshi Eisaki},
  journal= {arXiv preprint arXiv:1112.6078},
  year   = {2011}
}

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5 pages, 5 figures

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

Abstract

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