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

Weiqiang Yu; L. Ma; J. B. He; D. M. Wang; T. -L. Xia; G. F. Chen; Wei Bao

doi:10.1103/PhysRevLett.106.197001

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

Superconductivity 2015-05-20 v2 Strongly Correlated Electrons

Authors: Weiqiang Yu , L. Ma , J. B. He , D. M. Wang , T. -L. Xia , G. F. Chen , Wei Bao

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Abstract

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.

Keywords

77Se NMR iron selenide superconductor pairing symmetry spin dynamics Knight shift singlet pairing

Cite

@article{arxiv.1101.1017,
  title  = {77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2},
  author = {Weiqiang Yu and L. Ma and J. B. He and D. M. Wang and T. -L. Xia and G. F. Chen and Wei Bao},
  journal= {arXiv preprint arXiv:1101.1017},
  year   = {2015}
}

Comments

Chemical composition of crystals determined. Accepted in Physical Review Letters

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