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

Weiqiang Yu*, L. Ma, J. B. He, D. M. Wang, T.-L. Xia, G. F. Chen, Wei Bao

*Corresponding author for this work

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

66 Citations (Scopus)

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. 
Original languageEnglish
Article number197001
JournalPhysical Review Letters
Volume106
Issue number19
Online published9 May 2011
DOIs
Publication statusPublished - 13 May 2011
Externally publishedYes

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