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

Abstract

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}$c{m}^{-2},whichplacesoptimallydopedBFCAclosetotheUemuraline.Ourexperimentaldatashowsclearsignsofasuperconductinggapwith2$Δ_{1}$=6.2$\pm$0.8meV.Inadditionweshowthattheopticalspectraareconsistentwiththepresenceofanadditionalbandofstronglyscatteredcarrierswithalargergap,2$Δ_{2}$=14$\pm$ 2 meV.

5 pages, 4 figures

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