Raman scattering in superconducting NdO 1-x F x BiS 2 crystals
electron-phonon coupling, Raman scattering, superconductive mechanism
Superconductor Science and Technology
The recently discovered layered BiS 2 -based superconductors are of great interest due to their structural similarity to cuprate and iron-pnictide superconductors. We performed Raman scattering measurements on two superconducting crystals NdO 0.5 F 0.5 BiS 2 (T c = 4.5 K) and NdO 0.7 F 0.3 BiS 2 (T c = 4.8 K). We assigned observed Raman phonon modes with the aid of first-principles calculations. The asymmetric phonon mode around 118 cm -1 reveals a small electron-phonon coupling constant λ ∼ 0.16, which is insufficient to generate superconductivity at ∼4.5 K.
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DOI of published version
UNI ScholarWorks, Rod Library, University of Northern Iowa
Tian, Yong; Zhang, Anmin; Liu, Kai; Ji, Jianting; Liu, Jianzhong; Zhu, Xiyu; Wen, Hai Hu; Jin, Feng; Ma, Xiaoli; He, Rui; and Zhang, Qing Ming, "Raman scattering in superconducting NdO 1-x F x BiS 2 crystals" (2016). Faculty Publications. 1177.