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Phys. Rev. Lett. 90, 187001 (2003) [4 pages]

Hexagonal and Square Flux Line Lattices in CeCoIn5

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Morten Ring Eskildsen*
DPMC, University of Geneva, 24 Quai E.-Ansermet, CH-1211 Genève 4, Switzerland

Charles D. Dewhurst
Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France

Bart W. Hoogenboom†
DPMC, University of Geneva, 24 Quai E.-Ansermet, CH-1211 Genève 4, Switzerland

Cedomir Petrovic‡ and Paul C. Canfield
Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 25 November 2002; published 7 May 2003

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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.187001
DOI:
10.1103/PhysRevLett.90.187001
PACS:
74.25.Op, 74.70.Tx

*Electronic address: morten.eskildsen@physics.unige.ch

†Present address: M. E. Müller Institute for Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland.

‡Present address: Department of Physics, Brookhaven National Laboratory, Upton, New York 11973.

 
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