Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance

K. Kakuyanagi, M. Saitoh, K. Kumagai, S. Takashima, Minoru Nohara, H. Takagi, Y. Matsuda

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163 Citations (Scopus)

Abstract

We present a 115In NMR study of the quasi-two-dimensional heavy-fermion superconductor CeCoIn5 believed to host a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state. In the vicinity of the upper critical field and with a magnetic field applied parallel to the ab plane, the NMR spectrum exhibits a dramatic change below T*(H) which well coincides with the position of reported anomalies in specific heat and ultrasound velocity. We argue that our results provide the first microscopic evidence for the occurrence of a spatially modulated superconducting order parameter expected in a FFLO state. The NMR spectrum also implies an anomalous electronic structure of vortex cores.

Original languageEnglish
Article number047602
JournalPhysical Review Letters
Volume94
Issue number4
DOIs
Publication statusPublished - Feb 4 2005
Externally publishedYes

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textures
nuclear magnetic resonance
heavy fermion superconductors
specific heat
occurrences
vortices
anomalies
electronic structure
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance. / Kakuyanagi, K.; Saitoh, M.; Kumagai, K.; Takashima, S.; Nohara, Minoru; Takagi, H.; Matsuda, Y.

In: Physical Review Letters, Vol. 94, No. 4, 047602, 04.02.2005.

Research output: Contribution to journalArticle

Kakuyanagi, K. ; Saitoh, M. ; Kumagai, K. ; Takashima, S. ; Nohara, Minoru ; Takagi, H. ; Matsuda, Y. / Texture in the superconducting order parameter of CeCoIn5 revealed by nuclear magnetic resonance. In: Physical Review Letters. 2005 ; Vol. 94, No. 4.
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