Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.197001
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Funding
- Natural Science Foundation of China [10974254, 11034012, 11074304]
- National Basic Research Program of China (973 program) [2010CB923004, 2011CBA00112]
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We present a Se-77 NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2, in which T-c = 32 K. Below Tc, the Knight shift K-77 drops sharply with temperature, providing strong evidence for singlet pairing. Above T-c, Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-T-c superconductivity in this iron selenide system.
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