Gap in KFe2As2studied by small-angle neutron scattering observations of the magnetic vortex lattice
Physical Review B2011Vol. 84(2)
Citations Over TimeTop 10% of 2011 papers
H. Kawano‐Furukawa, C. J. Bowell, J. S. White, R. W. Heslop, A. S. Cameron, E. M. Forgan, Kunihiro Kihou, Chul‐Ho Lee, Akira Iyo, Hiroshi Eisaki, Taku Saito, Hideto Fukazawa, Yoh Kohori, R. Cubitt, C. D. Dewhurst, J. L. Gavilano, M. Zolliker
Abstract
By neutron scattering, we have observed a well-ordered magnetic vortex lattice (VL) in KFe${}_{2}$As${}_{2}$ single crystals. With the field along the $c$ axis, a nearly isotropic hexagonal VL is formed, with no symmetry transitions up to high fields, indicating a small anisotropy of the superconducting state around this axis. This rules out line nodes parallel to the $c$ axis, and thus $d$-wave or anisotropic $s$-wave pairing. However, the strong temperature dependence of the signal at $T\ensuremath{\ll}{T}_{c}$ shows that extremely small gap values exist; these may arise from nodal lines perpendicular to the $c$ axis.
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