2011/03/15 by C. S. Liu, Liu, C. S., W. C. Wu +1
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1103.3191
7 pages, 4 figures
arxiv created 2011/03/15 · arxiv updated 2015/03/18
Based on a two-band model, we study the electronic Raman scattering intensity in both normal and superconducting states of iron-pnictide superconductors. For the normal state, due to the match or mismatch of the symmetries between band hybridization and Raman vertex, it is predicted that overall B1g Raman intensity should be much weaker than that of the B2g channel. Moreover, in the non-resonant regime, there should exhibit a interband excitation peak at frequency ω≃ 7.3 t1 (6.8t1) in the B1g (B2g) channel. For the superconducting state, it is shown that β-band contributes most to the B2g Raman intensity as a result of multiple effects of Raman vertex, gap symmetry, and Fermi surface topology. Both extended s- and dxy-wave pairings in the unfolded BZ can give a good description to the reported B2g Raman data [Muschler \em et al., Phys. Rev. B. \bf 80, 180510 (2009).], while dx2-y2-wave pairing in the unfolded BZ seems to be ruled out.