Abstract
Inelastic neutron scattering from superconducting (SC) reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to - the 2D antiferromagnetic (AFM) wave vector of the parent compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the model with . The spin resonance at in the SC state displays the same anisotropy. The anisotropic fluctuations experimentally evolve into two distinct maxima only along the direction transverse to above indicating unusual quasipropagating excitations.
- Received 8 March 2010
DOI:https://doi.org/10.1103/PhysRevB.82.140503
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