Electron doping effects on the spin spectroscopy of BaFe2-xNixAs2 superconductors

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dc.contributor.authorLuo, HQen_AU
dc.contributor.authorGong, DLen_AU
dc.contributor.authorXie, Ten_AU
dc.contributor.authorLu, XYen_AU
dc.contributor.authorKamazawa, Ken_AU
dc.contributor.authorIida, Ken_AU
dc.contributor.authorKajimoto, Ren_AU
dc.contributor.authorIvanov, ASen_AU
dc.contributor.authorAdroja, DTen_AU
dc.contributor.authorKulda, Jen_AU
dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorDeng, GCen_AU
dc.contributor.authorLi, SLen_AU
dc.contributor.authorDai, PCen_AU
dc.date.accessioned2021-08-11T04:43:41Zen_AU
dc.date.available2021-08-11T04:43:41Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-08-10en_AU
dc.description.abstractHigh-temperature superconductivity in iron pnictides emerges from electron or hole doped parent compounds with antiferromagnetic order, which is argued to be associated with both the presence of high-energy spin excitations and a coupling between low-energy spin excitations and itinerant electrons. With more than 6 years\' efforts, we have used time-of-flight neutron spectroscopy to extensively map out the spin excitations in the electron-doped BaFe2-xNixAs2 especially around the overdoped zone boundary of superconductivity. We have found that the high energy spin fluctuations survive in the extremely high doping x=0.6 far beyond the superconducting dome, but the low energy spin excitations including the spin resonance mode is very sensitive to the electron dopings, by finally forming a large spin gap just after the disappearance of superconductivity in the overdoped regime. Further polarized neutron analysis indicate that the spin gap actually is anisotropic, and the longitudinal mode of spin fluctuations, as a hallmark of the itinerant magnetism from Fermi surface nesting, is totally eliminated together with the hole pockets near the electron-overdoped zone boundary of superconductivity.Our results suggest that the strong fluctuations from local moments give framework for magnetic interaction, while itinerant spin excitations originated from Fermi surface nesting are crucial to the superconductivity in iron pnictides.en_AU
dc.identifier.citationLuo, H., Gong, D., Xie, T., Lu, X., Kamazawa, K., Iida, K., Kajimoto, R., Ivanov, A., Adroja. D., Kulda, J., Danilkin, S., Deng, G., Li, S., & Dai, P. (2017). Electron doping effects on the spin spectroscopy of BaFe2-xNixAs2 superconductors. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from: http://www.icns2017.org/program.phpen_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencenameICNS 2017 (International Conference on Neutron Scattering)en_AU
dc.identifier.conferenceplaceDaejeon, South Koreaen_AU
dc.identifier.conferencestartdate9 July 2017en_AU
dc.identifier.urihttp://www.icns2017.org/program.phpen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11321en_AU
dc.language.isoenen_AU
dc.publisherInternational Conference on Neutron Scatteringen_AU
dc.subjectSuperconductivityen_AU
dc.subjectIronen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSpinen_AU
dc.subjectElectronsen_AU
dc.subjectDopingen_AU
dc.titleElectron doping effects on the spin spectroscopy of BaFe2-xNixAs2 superconductorsen_AU
dc.typeConference Abstracten_AU
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