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

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

2011-01-05

arxiv.org/abs/1101.1017v2

Phys. Rev. Lett. 106, 197001 (2011)

Physics

Condensed Matter

Superconductivity

Chemical composition of crystals determined. Accepted in Physical Review Letters

Scientific paper

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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