Abstract
The recently discovered layered BiS2-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 NdO0.5F0.5BiS2 (Tc = 4.5 K) and NdO0.7F0.3BiS2 (Tc = 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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