Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe$_{0.926}$Co$_{0.074}$)$_2$As$_2$

Details Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe$_{0.926}$Co$_{0.074}$)$_2$As$_2$ Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe$_{0.926}$Co$_{0.074}$)$_2$As$_2$

2010-03-08

arxiv.org/abs/1003.1687v3

Phys. Rev. B 82, 140503(R) (2010) (Editor's Suggestions)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Inelastic neutron scattering from superconducting (SC) Ba(Fe$_{0.926}$Co$_{0.074}$)$_2$As$_2$ reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to \textbf{Q}$_{\texttt{AFM}}=({1}{2}/{1}{2})$ - the 2D antiferromagnetic (AFM) wave-vector of the parent BaFe$_2$As$_2$ compound. The correlation length anisotropy of these low energy fluctuations is consistent with spin nematic correlations in the $J_1$-$J_2$ model with $J_1/J_2 \sim$ 1. The spin resonance at $\sim$8.3 meV in the SC state displays the same anisotropy. The anisotropic fluctuations experimentally evolve into two distinct maxima only along the direction transverse to \textbf{Q}$_{\texttt{AFM}}$ above $\sim$80 meV indicating unusual quasi-propagating excitations.

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