77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2
Autor: | Yu, Weiqiang, Ma, L., He, J. B., Wang, D. M., Xia, T. -L., Chen, G. F., Bao, Wei |
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Rok vydání: | 2011 |
Předmět: | |
Zdroj: | Phys. Rev. Lett. 106, 197001 (2011) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevLett.106.197001 |
Popis: | 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. Comment: Chemical composition of crystals determined. Accepted in Physical Review Letters |
Databáze: | arXiv |
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