Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

We report a doping dependent electronic Raman scattering measurements on iron-pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals. A strongly anisotropic gap is found at optimal doping for x=0.065 with ${\Delta }_{max}\sim 5{\Delta }_{min}$. Upon entering the coexistence region between superconducting (SC) and spin-density-wave (SDW) orders, the effective pairing energy scale is strongly reduced. Our results are interpreted in terms of a competition between SC and SDW orders for electronic state at the Fermi level. Our findings advocate for a strong connection between the SC and SDW gaps anisotropies which are both linked to interband interactions.

4 pages, 3 figures

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