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

C. S. Lian; H. Ding; J. T. Wang; N. L. Wang; P. Richard; S. F. Wu; S. M. Nie; X. B. Wang

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

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arxiv 1407.6774 v1 pith:3IWC6SBD submitted 2014-07-25 cond-mat.supr-con cond-mat.str-el

S. F. Wu , P. Richard , X. B. Wang , C. S. Lian , S. M. Nie , J. T. Wang , N. L. Wang , H. Ding This is my paper

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keywords ramancouplingelectron-phononmodescatteringsuperconductorsaccordanceactive

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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.

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