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000868049 1001_ $$0P:(DE-HGF)0$$aChen, Tong$$b0
000868049 245__ $$aAnisotropic spin fluctuations in detwinned FeSe
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000868049 520__ $$aSuperconductivity in FeSe emerges from a nematic phase that breaks four-fold rotational symmetry in the iron plane. This phase may arise from orbital ordering, spin fluctuations or hidden magnetic quadrupolar order. Here we use inelastic neutron scattering on a mosaic of single crystals of FeSe, detwinned by mounting on a BaFe2As2 substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF = (±1, 0) at low energies E = 6–11 meV in the normal state. This two-fold (C2) anisotropy is reduced at lower energies, 3–5 meV, indicating a gapped four-fold (C4) mode. In the superconducting state, however, the strong nematic anisotropy is again reflected in the spin resonance (E = 3.6 meV) at QAF with incommensurate scattering around 5–6 meV. Our results highlight the extreme electronic anisotropy of the nematic phase of FeSe and are consistent with a highly anisotropic superconducting gap driven by spin fluctuations.
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000868049 7001_ $$0P:(DE-HGF)0$$aChen, Youzhe$$b1
000868049 7001_ $$00000-0003-3028-377X$$aKreisel, Andreas$$b2
000868049 7001_ $$00000-0002-0409-1240$$aLu, Xingye$$b3
000868049 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, Astrid$$b4
000868049 7001_ $$0P:(DE-HGF)0$$aQiu, Yiming$$b5
000868049 7001_ $$00000-0001-6565-0192$$aPark, J. T.$$b6
000868049 7001_ $$00000-0001-5756-6433$$aPerring, Toby G.$$b7
000868049 7001_ $$00000-0003-0053-0178$$aStewart, J Ross$$b8
000868049 7001_ $$0P:(DE-HGF)0$$aCao, Huibo$$b9
000868049 7001_ $$0P:(DE-HGF)0$$aZhang, Rui$$b10
000868049 7001_ $$0P:(DE-HGF)0$$aLi, Yu$$b11
000868049 7001_ $$0P:(DE-HGF)0$$aRong, Yan$$b12
000868049 7001_ $$0P:(DE-HGF)0$$aWei, Yuan$$b13
000868049 7001_ $$00000-0002-9786-7553$$aAndersen, Brian M.$$b14
000868049 7001_ $$0P:(DE-HGF)0$$aHirschfeld, P. J.$$b15
000868049 7001_ $$0P:(DE-HGF)0$$aBroholm, Collin$$b16
000868049 7001_ $$00000-0002-6088-3170$$aDai, Pengcheng$$b17$$eCorresponding author
000868049 773__ $$0PERI:(DE-600)2088679-2$$a10.1038/s41563-019-0369-5$$gVol. 18, no. 7, p. 709 - 716$$n7$$p709 - 716$$tNature materials$$v18$$x1476-4660$$y2019
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