Hexagonal and Square Flux Line Lattices in CeCoIn5

Physics – Condensed Matter – Superconductivity

Scientific paper

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4 pages, 3 figs (1 color)

Scientific paper

10.1103/PhysRevLett.90.187001

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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