Experimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe1−xCox)2As2

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dc.citation.articleNumber205149
dc.citation.issueNumber20
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber93
dc.contributor.authorWang, Meng
dc.contributor.authorYi, M.
dc.contributor.authorSun, H. L.
dc.contributor.authorValdivia, P.
dc.contributor.authorKim, M.G.
dc.contributor.authorXu, Z. J.
dc.contributor.authorBerlijn, T.
dc.contributor.authorChristianson, A.D.
dc.contributor.authorChi, Songxue
dc.contributor.authorHashimoto, M.
dc.contributor.authorLu, D.H.
dc.contributor.authorLi, X.D.
dc.contributor.authorBourret-Courchesne, E.
dc.contributor.authorDai, Pengcheng
dc.contributor.authorLee, D.H.
dc.contributor.authorMaier, T.A.
dc.contributor.authorBirgeneau, R.J.
dc.date.accessioned2017-02-22T22:34:03Z
dc.date.available2017-02-22T22:34:03Z
dc.date.issued2016
dc.description.abstractWe report a combined study of the spin resonances and superconducting gaps for underdoped (Tc=19 K), optimally doped (Tc=25 K), and overdoped (Tc=19 K) Ba(Fe1−xCox)2As2 single crystals with inelastic neutron scattering and angle resolved photoemission spectroscopy. We find a quasi-two-dimensional spin resonance whose energy scales with the superconducting gap in all three compounds. In addition, anisotropic low energy spin excitation enhancements in the superconducting state have been deduced and characterized for the under and optimally doped compounds. Our data suggest that the quasi-two-dimensional spin resonance is a spin exciton that corresponds to the spin singlet-triplet excitations of the itinerant electrons. However, the intensity enhancements of the anisotropic spin excitations are dominated by the out-of-plane spin excitations of the ordered moments due to the suppression of damping in the superconducting state. Hence we offer an interpretation of the double energy scales differing from previous interpretations based on anisotropic superconducting energy gaps and systematically explain the doping-dependent trend across the phase diagram.
dc.identifier.citationWang, Meng, Yi, M., Sun, H. L., et al.. "Experimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe1−xCox)2As2." <i>Physical Review B,</i> 93, no. 20 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevB.93.205149.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.93.205149
dc.identifier.urihttps://hdl.handle.net/1911/93965
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleExperimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe1−xCox)2As2
dc.typeJournal article
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dc.type.publicationpublisher version
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