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001     874252
005     20210130004638.0
024 7 _ |a 10.1103/PhysRevLett.124.017001
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024 7 _ |a 1079-7114
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100 1 _ |a Shen, Shoudong
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245 _ _ |a Neutron Spin Resonance in the Heavily Hole-Doped KFe 2 As 2 Superconductor
260 _ _ |a College Park, Md.
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520 _ _ |a We report high-resolution neutron scattering measurements of the low energy spin fluctuations ofKFe2As2, the end member of the hole-doped Ba1−xKxFe2As2family with only hole pockets, above andbelow its superconducting transition temperatureTc(∼3.5K). Our data reveal clear spin fluctuations at theincommensurate wave vector (0.5δ,0,L), (δ¼0.2) (1-Fe unit cell), which exhibitL-modulationpeaking atL¼0.5. Upon cooling to the superconducting state, the incommensurate spin fluctuationsgradually open a spin gap and form a sharp spin resonance mode. The incommensurability (2δ¼0.4)ofthe resonance mode (∼1.2meV) is considerably larger than the previously reported value (2δ≈0.32)athigher energies (≥∼6meV). The determination of the momentum structure of spin fluctuation in the lowenergy limit allows a direct comparison with the realistic Fermi surface and superconducting gap structure.Our results point to ans-wave pairing with a reversed sign between the hole pockets near the zone center inKFe2As2.
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Zhang, Xiaowen
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700 1 _ |a Wo, Hongliang
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700 1 _ |a Shen, Yao
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700 1 _ |a Feng, Yu
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700 1 _ |a Schneidewind, A.
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700 1 _ |a Čermák, P.
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700 1 _ |a Wang, Wenbin
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700 1 _ |a Zhao, Jun
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773 _ _ |a 10.1103/PhysRevLett.124.017001
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