000868049 001__ 868049 000868049 005__ 20210130004045.0 000868049 0247_ $$2doi$$a10.1038/s41563-019-0369-5 000868049 0247_ $$2ISSN$$a1476-1122 000868049 0247_ $$2ISSN$$a1476-4660 000868049 0247_ $$2Handle$$a2128/23692 000868049 0247_ $$2altmetric$$aaltmetric:60721333 000868049 0247_ $$2pmid$$apmid:31110345 000868049 0247_ $$2WOS$$aWOS:000472020800016 000868049 037__ $$aFZJ-2019-06642 000868049 082__ $$a610 000868049 1001_ $$0P:(DE-HGF)0$$aChen, Tong$$b0 000868049 245__ $$aAnisotropic spin fluctuations in detwinned FeSe 000868049 260__ $$aBasingstoke$$bNature Publishing Group$$c2019 000868049 3367_ $$2DRIVER$$aarticle 000868049 3367_ $$2DataCite$$aOutput Types/Journal article 000868049 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1577694200_13800 000868049 3367_ $$2BibTeX$$aARTICLE 000868049 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000868049 3367_ $$00$$2EndNote$$aJournal Article 000868049 520__ $$aSuperconductivity in FeSe emerges from a nematic phase that breaks four-fold rotational symmetry in the iron plane. This phase may arise from orbital ordering, spin fluctuations or hidden magnetic quadrupolar order. Here we use inelastic neutron scattering on a mosaic of single crystals of FeSe, detwinned by mounting on a BaFe2As2 substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF = (±1, 0) at low energies E = 6–11 meV in the normal state. This two-fold (C2) anisotropy is reduced at lower energies, 3–5 meV, indicating a gapped four-fold (C4) mode. In the superconducting state, however, the strong nematic anisotropy is again reflected in the spin resonance (E = 3.6 meV) at QAF with incommensurate scattering around 5–6 meV. Our results highlight the extreme electronic anisotropy of the nematic phase of FeSe and are consistent with a highly anisotropic superconducting gap driven by spin fluctuations. 000868049 536__ $$0G:(DE-HGF)POF3-6G15$$a6G15 - FRM II / MLZ (POF3-6G15)$$cPOF3-6G15$$fPOF III$$x0 000868049 536__ $$0G:(DE-HGF)POF3-6212$$a6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621)$$cPOF3-621$$fPOF III$$x1 000868049 536__ $$0G:(DE-HGF)POF3-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)$$cPOF3-623$$fPOF III$$x2 000868049 588__ $$aDataset connected to CrossRef 000868049 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x0 000868049 65027 $$0V:(DE-MLZ)SciArea-170$$2V:(DE-HGF)$$aMagnetism$$x1 000868049 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0 000868049 693__ $$0EXP:(DE-MLZ)PANDA-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)PANDA-20140101$$6EXP:(DE-MLZ)SR2-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$ePANDA: Cold three axes spectrometer$$fSR2$$x0 000868049 693__ $$0EXP:(DE-MLZ)PUMA-20140101$$1EXP:(DE-MLZ)FRMII-20140101$$5EXP:(DE-MLZ)PUMA-20140101$$6EXP:(DE-MLZ)SR7-20140101$$aForschungs-Neutronenquelle Heinz Maier-Leibnitz $$ePUMA: Thermal three axes spectrometer$$fSR7$$x1 000868049 7001_ $$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. 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