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Hexagonal and Square Flux Line Lattices in CeCoIn5

M. R. Eskildsen·C. D. Dewhurst·B. W. Hoogenboom·C. Petrovic·P. C. Canfield
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Abstract

Using small-angle neutron scattering, we have imaged the magnetic flux line lattice (FLL) in the d-wave heavy-fermion superconductor CeCoIn5. At low fields we find a hexagonal FLL. Around 0.6 T this undergoes what is very likely a first-order transition to square symmetry, with the nearest neighbors oriented along the gap node directions. This orientation of the square FLL is consistent with theoretical predictions based on the d-wave order parameter symmetry.

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M. R. Eskildsen, C. D. Dewhurst, B. W. Hoogenboom, C. Petrovic, P. C. Canfield. 2002-11-26. Hexagonal and Square Flux Line Lattices in CeCoIn5. https://doi.org/10.1103/physrevlett.90.187001

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