77Se NMR study of the pairing symmetry and the spin dynamics in KyFe2-xSe2

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Weiqiang Yu
  • L. Ma
  • J. B. He
  • D. M. Wang
  • T.-L. Xia
  • G. F. Chen

Detail(s)

Original languageEnglish
Article number197001
Journal / PublicationPhysical Review Letters
Volume106
Issue number19
Online published9 May 2011
Publication statusPublished - 13 May 2011
Externally publishedYes

Abstract

We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2 , in which Tc =32K. Below Tc , the Knight shift 77K drops sharply with temperature, providing strong evidence for singlet pairing. Above Tc , Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-Tc superconductivity in this iron selenide system. 

Citation Format(s)

77Se NMR study of the pairing symmetry and the spin dynamics in KyFe2-xSe2. / Yu, Weiqiang; Ma, L.; He, J. B. et al.
In: Physical Review Letters, Vol. 106, No. 19, 197001, 13.05.2011.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review