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024 7 _ |a 10.1103/PhysRevB.90.140502
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024 7 _ |a 0163-1829
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024 7 _ |a 0556-2805
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024 7 _ |a 1095-3795
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024 7 _ |a 1098-0121
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037 _ _ |a FZJ-2014-05605
082 _ _ |a 530
100 1 _ |a Zhang, Chenglin
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245 _ _ |a Anisotropic neutron spin resonance in underdoped superconducting ${\mathrm{NaFe}}_{1-x}{\mathrm{Co}}_{x}\mathrm{As}$
260 _ _ |a College Park, Md.
|c 2014
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336 7 _ |a Journal Article
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520 _ _ |a 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 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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542 _ _ |i 2014-10-01
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|u http://link.aps.org/licenses/aps-default-license
542 _ _ |i 2015-10-01
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700 1 _ |a Song, Yu
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700 1 _ |a Regnault, L.-P.
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700 1 _ |a Su, Yixi
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700 1 _ |a Enderle, M.
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700 1 _ |a Kulda, J.
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700 1 _ |a Tan, Guotai
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700 1 _ |a Sims, Zachary C.
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700 1 _ |a Egami, Takeshi
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700 1 _ |a Si, Qimiao
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700 1 _ |a Dai, Pengcheng
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773 1 8 |a 10.1103/physrevb.90.140502
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773 _ _ |a 10.1103/PhysRevB.90.140502
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856 4 _ |u http://dx.doi.org/10.1103/PhysRevB.90.140502
856 4 _ |u https://juser.fz-juelich.de/record/172056/files/FZJ-2014-05605.pdf
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999 C 5 |a 10.1021/ja800073m
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