Optical properties of BaFe$_{2-x}$Co$_x$As$_2$

Details Optical properties of BaFe$_{2-x}$Co$_x$As$_2$ Optical properties of BaFe$_{2-x}$Co$_x$As$_2$

2009-12-03

arxiv.org/abs/0912.0636v1

EPL 90 (2010) 37005

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We present detailed temperature dependent optical data on BaFe$_{2-x}$Co$_{x}$As$_{2}$ (BCFA), with x = 0.14, between 4 meV and 6.5 eV. We analyze our spectra to determine the main optical parameters and show that in this material the interband conductivity already starts around 10 meV. We determine the superfluid density to be 2.2 10^{7}$ cm^{-2}, which places optimally doped BFCA close to the Uemura line. Our experimental data shows clear signs of a superconducting gap with 2$\Delta_{1}$ = 6.2 $\pm$ 0.8 meV. In addition we show that the optical spectra are consistent with the presence of an additional band of strongly scattered carriers with a larger gap, 2$\Delta_{2}$ = 14 $\pm$ 2 meV.

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