Journal
PHYSICAL REVIEW B
Volume 84, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.024507
Keywords
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Funding
- Yamada Science Foundation
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [20102006]
- MEXT
- Chiba University
- United Kingdom Engineering and Physical Sciences Research Council
- Swiss National Centre of Competence
- [20102005]
- Grants-in-Aid for Scientific Research [20102005, 22684016, 21540351, 22540380] Funding Source: KAKEN
- Engineering and Physical Sciences Research Council [EP/G027161/1] Funding Source: researchfish
- EPSRC [EP/G027161/1] Funding Source: UKRI
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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 << T-c shows that extremely small gap values exist; these may arise from nodal lines perpendicular to the c axis.
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