Hexagonal and Square Flux Line Lattices in CeCoIn5

Phys. Rev. Lett. 90, 187001 – Published 7 May 2003
Morten Ring Eskildsen, Charles D. Dewhurst, Bart W. Hoogenboom, Cedomir Petrovic, and Paul C. Canfield

Abstract

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.

DOI: http://dx.doi.org/10.1103/PhysRevLett.90.187001

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  • Received 25 November 2002
  • Published 7 May 2003

© 2003 The American Physical Society

Authors & Affiliations

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

  • *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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