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024 7 _ |a 10.1038/s41598-017-10208-1
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100 1 _ |a Waßer, F.
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245 _ _ |a Anisotropic resonance modes emerging in an antiferromagnetic superconducting state
260 _ _ |a London
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520 _ _ |a Two strong arguments in favor of magnetically driven unconventional superconductivity arise from the coexistence and closeness of superconducting and magnetically ordered phases on the one hand, and from the emergence of magnetic spin-resonance modes at the superconducting transition on the other hand. Combining these two arguments one may ask about the nature of superconducting spin-resonance modes occurring in an antiferromagnetic state. This problem can be studied in underdoped BaFe2 As2, for which the local coexistence of large moment antiferromagnetism and superconductivity is well established by local probes. However, polarized neutron scattering experiments are required to identify the nature of the resonance modes. In the normal state of Co underdoped BaFe2 As2 the antiferromagnetic order results in broad magnetic gaps opening in all three spin directions that are reminiscent of the magnetic response in the parent compound. In the superconducting state two distinct anisotropic resonance excitations emerge, but in contrast to numerous studies on optimum and over-doped BaFe2 As2 there is no isotropic resonance excitation. The two anisotropic resonance modes appearing within the antiferromagnetic phase are attributed to a band selective superconducting state, in which longitudinal magnetic excitations are gapped by antiferromagnetic order with sizable moment.
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700 1 _ |a Lee, C. H.
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700 1 _ |a Kihou, K.
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700 1 _ |a Steffens, P.
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700 1 _ |a Qureshi, N.
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700 1 _ |a Braden, M.
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773 _ _ |a 10.1038/s41598-017-10208-1
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