Spin density wave and superconductivity in CaFe_{1-x}Co_{x}AsF studied by nuclear magnetic resonance

S. Tsutsumi; N. Fujiwara; S. Matsuishi; H. Hosono

doi:10.1103/PhysRevB.86.060515

Spin density wave and superconductivity in CaFe_{1-x}Co_{x}AsF studied by nuclear magnetic resonance

Superconductivity 2012-10-04 v2

Authors: S. Tsutsumi , N. Fujiwara , S. Matsuishi , H. Hosono

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Abstract

We performed nuclear magnetic resonance (NMR) measurements to investigate the evolution of spin-density-wave (SDW) and superconducting (SC) states upon electron doping in CaFe_{1-x}Co_{x}AsF, which exhibits an intermediate phase diagram between those of LaFeAsO_{1-x}F_x and Ba(Fe_{1-x}Co_x)_2As_2. We found that homogeneous coexistence of the incommensurate SDW and SC states occurs only in a narrow doping region around the crossover regime, which supports S_{+-}-wave symmetry. However, only the structural phase transition survives upon further doping, which agrees with predictions from orbital fluctuation theory. The transitional features upon electron doping imply that both spin and orbital fluctuations are involved in the superconducting mechanism.

Keywords

nuclear magnetic resonance spin-density wave superconductivity electron doping CaFeAsF S+-wave symmetry orbital fluctuations phase diagram

Cite

@article{arxiv.1208.0141,
  title  = {Spin density wave and superconductivity in CaFe_{1-x}Co_{x}AsF studied by nuclear magnetic resonance},
  author = {S. Tsutsumi and N. Fujiwara and S. Matsuishi and H. Hosono},
  journal= {arXiv preprint arXiv:1208.0141},
  year   = {2012}
}

Spin density wave and superconductivity in CaFe_{1-x}Co_{x}AsF studied by nuclear magnetic resonance

Abstract

Keywords

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