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
Rok vydání:	2011
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
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
Externí odkaz:	http://arxiv.org/abs/1101.1017 Zobrazit plný text záznamu View this record from Arxiv