Hexagonal and square flux line lattices in CeCoIn5.
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 most 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.
Eskildsen
Morten Ring
MR
DPMC, University of Geneva, 24 Quai E.-Ansermet, CH-1211 Genève 4, Switzerland. morten.eskildsen@physics.unige.ch
Dewhurst
Charles D
CD
Hoogenboom
Bart W
BW
Petrovic
Cedomir
C
Canfield
Paul C
PC