Measurement of a double neutron-spin resonance and an anisotropic energy gap for underdoped superconducting NaFe0.985Co0.015As using inelastic neutron scattering.

@article{Zhang2013MeasurementOA,
  title={Measurement of a double neutron-spin resonance and an anisotropic energy gap for underdoped superconducting NaFe0.985Co0.015As using inelastic neutron scattering.},
  author={Chenglin Zhang and R Yu and Yixi Su and Yu Song and Miaoyin Wang and Guotai Tan and Takeshi Egami and Jaime A. Fernandez-Baca and Enrico Faulhaber and Qimiao Si and Pengcheng Dai},
  journal={Physical review letters},
  year={2013},
  volume={111 20},
  pages={
          207002
        }
}
  • C. Zhang, R. Yu, +8 authors P. Dai
  • Published 12 November 2013
  • Physics, Medicine
  • Physical review letters
We use inelastic neutron scattering to show that superconductivity in electron-underdoped NaFe0.985Co0.015As induces a dispersive sharp resonance near E(r1)=3.25  meV and a broad dispersionless mode at E(r2)=6  meV. However, similar measurements on overdoped superconducting NaFe0.935Co0.045As find only a single sharp resonance at E(r)=7  meV. We connect these results with the observations of angle-resolved photoemission spectroscopy that the superconducting gaps in the electron Fermi pockets… Expand
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