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Hexagonal and Square Flux Line Lattices in CeCoIn5

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arxiv cond-mat/0211585 v1 pith:YEK25GTJ submitted 2002-11-26 cond-mat.supr-con

Hexagonal and Square Flux Line Lattices in CeCoIn5

M. R. Eskildsen , C. D. Dewhurst , B. W. Hoogenboom , C. Petrovic , P. C. Canfield This is my paper
classification cond-mat.supr-con
keywords squarececoin5d-wavefluxhexagonallinesymmetryalong
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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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