Two-band model of Raman scattering on iron pnictide Ba (Fe1-X Co x) 2 As 2 superconductors

C. S. Liu, Hong Yan Lu, W. C. Wu*


研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)


Based on a two-band model, we theoretically study the electronic Raman scattering spectra in both normal and superconducting states of iron-pnictide Ba(Fe1-xCox2As2 superconductors. In the normal state, due to the match or mismatch of band hybridization and Raman vertex symmetries, overall B2g Raman intensity is found to be much stronger than that of the B1g channel. Besides, in the non-resonant limit, there could exhibit an interband excitation peak at high frequency ω7.3t1(6.8t1) in the B1 gB2g) channel with t1 the nearest-neighbor hopping. In the superconducting state, due to the composite effect of Raman vertex, gap symmetry, and Fermi surface topology, both B1g and B2g Raman intensities are dominated by α- (β-) band contribution for the extended s-wave (dx2-y2-wave) pairing, whereas both bands are equally important for the - wave pairing. It is shown that both extended s- and -wave pairings can lead to a good fitting for the reported B1g data Muschler et al. (2009) [11], while the dx2-y2-wave pairing seems not favorable.

頁(從 - 到)44-50
期刊Physica C: Superconductivity and its applications
出版狀態已發佈 - 2014 6月 15

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程


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