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000874252 245__ $$aNeutron Spin Resonance in the Heavily Hole-Doped KFe 2 As 2 Superconductor
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000874252 520__ $$aWe 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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000874252 7001_ $$0P:(DE-HGF)0$$aZhang, Xiaowen$$b1
000874252 7001_ $$0P:(DE-HGF)0$$aWo, Hongliang$$b2
000874252 7001_ $$0P:(DE-HGF)0$$aShen, Yao$$b3
000874252 7001_ $$0P:(DE-HGF)0$$aFeng, Yu$$b4
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000874252 7001_ $$0P:(DE-Juel1)159141$$aČermák, P.$$b6
000874252 7001_ $$0P:(DE-HGF)0$$aWang, Wenbin$$b7
000874252 7001_ $$00000-0002-0421-8934$$aZhao, Jun$$b8$$eCorresponding author
000874252 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.124.017001$$gVol. 124, no. 1, p. 017001$$n1$$p017001$$tPhysical review letters$$v124$$x1079-7114$$y2020
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