New high field state of flux line lattice in CeCoIn5

Y. Kasahara, T. Watanabe, K. Izawa, T. Sakakibara, C. J. Van Der Beek, T. Hanaguri, M. Nohara, H. Takagi, H. Shishido, R. Settai, Y. Onuki, Y. Matsuda

Research output: Contribution to journalConference articlepeer-review


We have measured the ultrasound velocity of quasi-two-dimensional superconductor CeCoIn5 with extremely large Pauli paramagnetic susceptibility. The results indicate that the new high field superconducting phase, which is revealed by the recent heat capacity measurements, is characterized by the unusual softening of flux line lattice. The softening is most likely due to the collapse of the flux line lattice tilt modulus and transition to quasi-two-dimensional vortex state. These results provide a strong evidence that the high field phase is the Fulde-Ferrell-Larkin-Ovchinnikov phase, in which the order parameter is spatially modulated and has planar nodes aligned perpendicularly to the vortices.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberI
Publication statusPublished - Oct 1 2005
Externally publishedYes
EventProceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity -
Duration: Nov 23 2004Nov 25 2004


  • CeCoIn
  • FFLO state
  • Flux line lattice
  • Ultrasound velocity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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