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Article: Raman spectra in iron-based quaternary CeO1-xFxFeAs and LaO1-xFxFeAs

TitleRaman spectra in iron-based quaternary CeO<inf>1-x</inf>F<inf>x</inf>FeAs and LaO<inf>1-x</inf>F<inf>x</inf>FeAs
Authors
Issue Date2009
Citation
Superconductor Science and Technology, 2009, v. 22, n. 1 How to Cite?
AbstractRaman spectra have been measured on iron-based quaternary CeO 1-x F x FeAs and LaO 1-x F x FeAs with different amounts of fluorine doping at room temperatures. A group analysis has been made to clarify the optical modes. Based on first-principle calculations, the observed phonon modes can be assigned accordingly. In LaO 1-x F x FeAs, the E g and A 1g modes related to the vibrations of La are suppressed with increasing F doping. However, F doping only has a small effect on the E g and A 1g modes of Fe and As. The Raman modes of La and As are absent in rare-earth substituted CeO 1-x F x FeAs, and the E g mode of oxygen, corresponding to the in-plane vibration of oxygen, moves to around 450cm -1 and shows a very sharp peak. The electronic scattering background is low, and electron-phonon coupling is not evident for the observed phonon modes. Three features are found above 500cm -1 , which may be associated with multi-phonon processes. Nevertheless, it is also possibl e that they are related to magnetic fluctuations or interband transitions of d orbitals, considering their energies. © 2009 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/254429
ISSN
2015 Impact Factor: 2.717
2015 SCImago Journal Rankings: 0.824

 

DC FieldValueLanguage
dc.contributor.authorZhao, S. C.-
dc.contributor.authorHou, D.-
dc.contributor.authorWu, Y.-
dc.contributor.authorXia, T. L.-
dc.contributor.authorZhang, A. M.-
dc.contributor.authorChen, G. F.-
dc.contributor.authorLuo, J. L.-
dc.contributor.authorWang, N. L.-
dc.contributor.authorWei, J. H.-
dc.contributor.authorLu, Z. Y.-
dc.contributor.authorZhang, Q. M.-
dc.date.accessioned2018-06-19T15:40:31Z-
dc.date.available2018-06-19T15:40:31Z-
dc.date.issued2009-
dc.identifier.citationSuperconductor Science and Technology, 2009, v. 22, n. 1-
dc.identifier.issn0953-2048-
dc.identifier.urihttp://hdl.handle.net/10722/254429-
dc.description.abstractRaman spectra have been measured on iron-based quaternary CeO 1-x F x FeAs and LaO 1-x F x FeAs with different amounts of fluorine doping at room temperatures. A group analysis has been made to clarify the optical modes. Based on first-principle calculations, the observed phonon modes can be assigned accordingly. In LaO 1-x F x FeAs, the E g and A 1g modes related to the vibrations of La are suppressed with increasing F doping. However, F doping only has a small effect on the E g and A 1g modes of Fe and As. The Raman modes of La and As are absent in rare-earth substituted CeO 1-x F x FeAs, and the E g mode of oxygen, corresponding to the in-plane vibration of oxygen, moves to around 450cm -1 and shows a very sharp peak. The electronic scattering background is low, and electron-phonon coupling is not evident for the observed phonon modes. Three features are found above 500cm -1 , which may be associated with multi-phonon processes. Nevertheless, it is also possibl e that they are related to magnetic fluctuations or interband transitions of d orbitals, considering their energies. © 2009 IOP Publishing Ltd.-
dc.languageeng-
dc.relation.ispartofSuperconductor Science and Technology-
dc.titleRaman spectra in iron-based quaternary CeO<inf>1-x</inf>F<inf>x</inf>FeAs and LaO<inf>1-x</inf>F<inf>x</inf>FeAs-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0953-2048/22/1/015017-
dc.identifier.scopuseid_2-s2.0-58149508074-
dc.identifier.volume22-
dc.identifier.issue1-
dc.identifier.spagenull-
dc.identifier.epagenull-
dc.identifier.eissn1361-6668-

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