Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)2As2

H. -F. Li; C. Broholm; D. Vaknin; R. M. Fernandes; D. L. Abernathy; M. B. Stone; D. K. Pratt; W. Tian; Y. Qiu; N. Ni; S. O. Diallo; J. L. Zarestky; S. L. Bud'ko; P. C. Canfield; R. J. McQueeney

doi:10.1103/PhysRevB.82.140503

Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)2As2

Superconductivity 2014-07-08 v4 Strongly Correlated Electrons

Authors: H. -F. Li , C. Broholm , D. Vaknin , R. M. Fernandes , D. L. Abernathy , M. B. Stone , D. K. Pratt , W. Tian , Y. Qiu , N. Ni , S. O. Diallo , J. L. Zarestky , S. L. Bud'ko , P. C. Canfield , R. J. McQueeney

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Abstract

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.

Keywords

spin excitations superconductivity iron-based superconductors inelastic neutron scattering spin resonance anisotropy quasi-propagating excitations spin nematic correlations

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@article{arxiv.1003.1687,
  title  = {Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)2As2},
  author = {H. -F. Li and C. Broholm and D. Vaknin and R. M. Fernandes and D. L. Abernathy and M. B. Stone and D. K. Pratt and W. Tian and Y. Qiu and N. Ni and S. O. Diallo and J. L. Zarestky and S. L. Bud'ko and P. C. Canfield and R. J. McQueeney},
  journal= {arXiv preprint arXiv:1003.1687},
  year   = {2014}
}

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Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)2As2

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