Optical Study of BaFe${}_2$As${}_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity

Abstract

Temperature-dependent reflectivity measurements in the frequency range 85 - 7000 cm${}^{-1}$ were performed on BaFe${}_2$As${}_2$ single crystals under pressure up to $\sim$5 GPa. The corresponding pressure- and temperature-dependent optical conductivity was analyzed with the Drude-Lorentz model to extract the coherent and incoherent contributions. The gradual suppression of the spin-density wave (SDW) state with increasing pressure and the appearance of the superconducting phase coexisting with the SDW phase at 3.6~GPa were observed. At 3.6~GPa, the reflectivity reaches unity below $\sim$95~cm${}^{-1}$ indicating the opening of the superconducting gap and shows a full gap tendency at 6 K.

9 pages, 7 figures, Accepted for a publication in Phys. Rev. B

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• Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFe${}_2$As${}_2$ under High Pressures