Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs

Chenglin Zhang; Yu Song; L. P. Regnault; Yixi Su; M. Enderle; J. Kulda; Guotai Tan; Zachary C. Sims; Takeshi Egami; Qimiao Si; Pengcheng Dai

doi:10.1103/PhysRevB.90.140502

Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs

Superconductivity 2015-06-23 v1

Authors: Chenglin Zhang , Yu Song , L. P. Regnault , Yixi Su , M. Enderle , J. Kulda , Guotai Tan , Zachary C. Sims , Takeshi Egami , Qimiao Si , Pengcheng Dai

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Abstract

We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a-axis of the orthorhombic structure and NaFe0.935Co0.045As (C45) without AF order. In previous unpolarized INS work, spin excitations in C15 were found to have a dispersive sharp resonance near Er1=3.25 meV and a broad dispersionless mode at Er2=6 meV. Our neutron polarization analysis reveals that the dispersive resonance in C15 is highly anisotropic and polarized along the a- and c-axis, while the dispersionless mode is isotropic similar to that of C45. Since the a-axis polarized spin excitations of the anisotropic resonance appear below Tc, our data suggests that the itinerant electrons contributing to the magnetism are also coupled to the superconductivity.

Keywords

anisotropic spin resonance inelastic neutron scattering superconductivity NaFe1-xCoxAs antiferromagnetic order spin excitations

Cite

@article{arxiv.1409.6416,
  title  = {Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs},
  author = {Chenglin Zhang and Yu Song and L. P. Regnault and Yixi Su and M. Enderle and J. Kulda and Guotai Tan and Zachary C. Sims and Takeshi Egami and Qimiao Si and Pengcheng Dai},
  journal= {arXiv preprint arXiv:1409.6416},
  year   = {2015}
}

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PRB(R), 2014

Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs

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