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

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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Inelastic neutron scattering from superconducting (SC) Ba (Fe 0.926 Co0.074)2 As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to Q AFM = (1 2 1 2) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2 As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1-J2 model with J1/J 2 ∼1. The spin resonance at ∼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 QAFM above ∼80 meV indicating unusual quasipropagating excitations.

Original languageEnglish (US)
Article number140503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - Oct 12 2010
Externally publishedYes


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