Raman scattering investigation of the electron-phonon coupling in superconducting Nd(O,F)BiS${}_2$

Abstract

We have performed polarized Raman scattering measurements on the newly discovered superconductor Nd(O,F)BiS${}_2$ ($T_c=4$ K). We observe 2 Raman active modes, with frequencies in accordance with first-principles calculations. One A${}_{1g}$ phonon mode at 112.4 cm${}^{-1}$ exhibits a Fano line shape due to electron-phonon coupling. We find a resonance for this mode at 2.45 eV excitation energy. We estimate a 0.68 contribution of this mode to the electron-phonon coupling constant $\lambda$. Our Raman results suggest that the BiS${}_2$-based superconductors are possibly phonon-mediated BCS superconductors.

arXiv comment5 pages, 3 figures, 1 table

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• Raman scattering in superconducting NdO1-xFxBiS2 crystals
• Direct Observation of an Incommensurate Charge Density Wave in the BiS2-based Superconductor NdO1-xFxBiS2
• Pressure-induced superconductivity in layered pnictogen diselenide NdO${}_{0.8}$F${}_{0.2}$Sb${}_{1-x}$Bi${}_x$Se${}_2$ (x = 0.3 and 0.7)
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• Phonons, Q-dependent Kondo spin fluctuations, and 4$\text{f}$/phonon resonance in YbAl${}_3$
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