Gap in KFe2As2 studied by small-angle neutron scattering observations of the magnetic vortex lattice

H Kawano-Furukawa, CJ Bowell, JS White, Richard Heslop, Alistair Cameron, Edward Forgan, K Kihou, CH Lee, A Iyo, H Eisaki, T Saito, H Fukazawa, Y Kohori, R Cubitt, CD Dewhurst, JL Gavilano, M Zolliker

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47 Citations (Scopus)

Abstract

By neutron scattering, we have observed a well-ordered magnetic vortex lattice (VL) in KFe2As2 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
Original languageEnglish
Pages (from-to)024507
Number of pages1
JournalPhysical Review B
Volume84
Issue number2
DOIs
Publication statusPublished - 1 Jul 2011

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