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arxiv: 1101.1017 · v2 · pith:6X5CYLMJnew · submitted 2011-01-05 · ❄️ cond-mat.supr-con · cond-mat.str-el

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

Weiqiang Yu , L. Ma , J. B. He , D. M. Wang , T.-L. Xia , G. F. Chen , Wei Bao This is my paper
classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords ironkyfe2-xse2pairingselenideabovebehaviorbelowconstraints
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We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2, in which Tc = 32 K. 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.

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