paper

Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

arXiv:1007.0720 · doi:10.1103/PhysRevB.82.180521

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 $I^_{ma x} \sim 5 I^_{min}$ . 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

Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(Fe1−x​Cox​)2​As2​

Abstract

Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$