Optical spectroscopy study of Nd(O,F)BiS2 single crystals

Abstract

We present an optical spectroscopy study on F-substituted NdOBiS${}_2$ superconducting single crystals grown using KCl/LiCl flux method. The measurement reveals a simple metallic response with a relatively low screened plasma edge near 5000 \cm. The plasma frequency is estimated to be 2.1 eV, which is much smaller than the value expected from the first-principles calculations for an electron doping level of x=0.5, but very close to the value based on a doping level of 7$\%$ of itinerant electrons per Bi site as determined by ARPES experiment. The energy scales of the interband transitions are also well reproduced by the first-principles calculations. The results suggest an absence of correlation effect in the compound, which essentially rules out the exotic pairing mechanism for superconductivity or scenario based on the strong electronic correlation effect. The study also reveals that the system is far from a CDW instability as being widely discussed for a doping level of x=0.5.

5 pages, 5 figures

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• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
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Cited by in corpus (4)

• Raman scattering investigation of the electron-phonon coupling in superconducting Nd(O,F)BiS${}_2$
• Superconductivity and its Enhancement under High Pressure in "F-free" Single Crystals of CeOBiS${}_2$
• Effect of yttrium substitution on the superconducting properties of the system La${}_{1-\text{x}}$Y${}_{\text{x}}$O${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Enhancement of Superconductivity in La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$