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.

5 pages, 3 figures, 1 table

References in corpus (5)

• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Evolution of superconductivity in LaO1-xFxBiS2 prepared by high pressure technique
• Stabilization of high-Tc phase of BiS2-based superconductor LaO0.5F0.5BiS2 using high-pressure synthesis
• Optical spectroscopy study of Nd(O,F)BiS2 single crystals
• Suppression of superconductivity in layered Bi4O4S3 by Ag doping

Cited by in corpus (5)

• Raman scattering investigation of large positive magnetoresistance material WTe${}_2$
• SnAs-based layered superconductor NaSn2As2
• Superconducting gap symmetry of the BiS${}_2$-based superconductor LaO${}_{0.5}$F${}_{0.5}$BiSSe elucidated through specific heat measurement
• Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3
• Coupling of optical phonons with Kondo effect and magnetic orders in antiferromagnetic Kondo lattice CeAuSb${}_2$