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Raman spectra in iron-based quaternary CeO1−xFxFeAs and LaO1−xFxFeAs

Raman spectra in iron-based quaternary CeO1−xFxFeAs and LaO1−xFxFeAs,10.1088/0953-2048/22/1/015017,Superconductor Science & Technology,S C Zhao,D Hou,

Raman spectra in iron-based quaternary CeO1−xFxFeAs and LaO1−xFxFeAs   (Citations: 1)
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Raman spectra have been measured on iron-based quaternary CeO1−xFxFeAs and LaO1−xFxFeAs 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 LaO1−xFxFeAs, the Eg and A1g modes related to the vibrations of La are suppressed with increasing F doping. However, F doping only has a small effect on the Eg and A1g modes of Fe and As. The Raman modes of La and As are absent in rare-earth substituted CeO1−xFxFeAs, and the Eg mode of oxygen, corresponding to the in-plane vibration of oxygen, moves to around 450 cm−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 500 cm−1, which may be associated with multi-phonon processes. Nevertheless, it is also possible that they are related to magnetic fluctuations or interband transitions of d orbitals, considering their energies.
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