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

Forget, A.; Sacuto, A.; Colson, D; Méasson, M. -A.; Cazayous, M.; Gallais, Y; Chauvière, L

doi:10.1103/PhysRevB.82.180521

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

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Author(s): A. Forget, A. Sacuto, D Colson, M. Méasson, M. Cazayous, Y Gallais, L Chauvière

Publication date: 2010-12-14

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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.

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Most cited references 13

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Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx

I. Mazin, D. J. Singh, M. Johannes … (2008)

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Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO$_{1-x}$F$_x$}

Ryotaro Arita, Hidetomo Usui, Seiichiro Onari … (2008)

For a newly discovered iron-based high $T_c$ superconductor LaFeAsO$_{1-x}$F$_x$, we have constructed a minimal model, where inclusion of all the five Fe $d$ bands is found to be necessary. Random-phase approximation is applied to the model to investigate the origin of superconductivity. We conclude that the multiple spin fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave pairing, while d-wave pairing can also be another candidate.