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

E. Uykur; T. Kobayashi; W. Hirata; S. Miyasaka; S. Tajima; C. A. Kuntscher

doi:10.1103/PhysRevB.92.245133

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

Superconductivity 2016-01-20 v1

Authors: E. Uykur , T. Kobayashi , W. Hirata , S. Miyasaka , S. Tajima , C. A. Kuntscher

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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.

Keywords

BaFe2As2 high pressure optical conductivity spin-density-wave superconductivity Drude-Lorentz model coexistence

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@article{arxiv.1511.09005,
  title  = {Optical Study of BaFe$_2$As$_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity},
  author = {E. Uykur and T. Kobayashi and W. Hirata and S. Miyasaka and S. Tajima and C. A. Kuntscher},
  journal= {arXiv preprint arXiv:1511.09005},
  year   = {2016}
}

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

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

Abstract

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