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000172056 0247_ $$2doi$$a10.1103/PhysRevB.90.140502
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000172056 1001_ $$0P:(DE-HGF)0$$aZhang, Chenglin$$b0$$eCorresponding Author
000172056 245__ $$aAnisotropic neutron spin resonance in underdoped superconducting ${\mathrm{NaFe}}_{1-x}{\mathrm{Co}}_{x}\mathrm{As}$
000172056 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000172056 520__ $$aWe use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a axis of the orthorhombic structure and NaFe0.935Co0.045As (C45) without AF order. In previous unpolarized INS work, spin excitations in C15 were found to have a dispersive sharp resonance near Er1=3.25 meV and a broad dispersionless mode at Er2=6 meV. Our neutron polarization analysis reveals that the dispersive resonance in C15 is highly anisotropic and polarized along the a and c axes, while the dispersionless mode is isotropic similar to that of C45. Since the a-axis polarized spin excitations of the anisotropic resonance appear below Tc, our data suggests that the itinerant electrons contributing to the magnetism are also coupled to the superconductivity.
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000172056 7001_ $$0P:(DE-HGF)0$$aSong, Yu$$b1
000172056 7001_ $$0P:(DE-HGF)0$$aRegnault, L.-P.$$b2
000172056 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b3$$ufzj
000172056 7001_ $$0P:(DE-HGF)0$$aEnderle, M.$$b4
000172056 7001_ $$0P:(DE-HGF)0$$aKulda, J.$$b5
000172056 7001_ $$0P:(DE-HGF)0$$aTan, Guotai$$b6
000172056 7001_ $$0P:(DE-HGF)0$$aSims, Zachary C.$$b7
000172056 7001_ $$0P:(DE-HGF)0$$aEgami, Takeshi$$b8
000172056 7001_ $$0P:(DE-HGF)0$$aSi, Qimiao$$b9
000172056 7001_ $$0P:(DE-HGF)0$$aDai, Pengcheng$$b10
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000172056 8564_ $$uhttp://dx.doi.org/10.1103/PhysRevB.90.140502
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