Hexagonal and Square Flux Line Lattices in CeCoIn5

Details Hexagonal and Square Flux Line Lattices in CeCoIn5 Hexagonal and Square Flux Line Lattices in CeCoIn5

2002-11-26

arxiv.org/abs/cond-mat/0211585v1

Phys. Rev. Lett. 90, 187001 (2003)

Physics

Condensed Matter

Superconductivity

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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