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Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs

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arxiv 1409.6416 v1 pith:R6SCNRBS submitted 2014-09-23 cond-mat.supr-con

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
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Takeshi Egami Qimiao Si Pengcheng Dai
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classification cond-mat.supr-con
keywords resonancespinanisotropicexcitationsneutronpolarizeda-axisalong
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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.

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