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

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.

preprint2011arXivOpen access
Weiqiang YuL. MaJ. B. HeD. M. WangT. -L. XiaG. F. ChenWei Bao
cond-mat.supr-concond-mat.str-el
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Open access7 authors2 topics
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Weiqiang YuL. MaJ. B. HeD. M. WangT. -L. XiaG. F. ChenWei Bao

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