Measurement of magnetic excitations in the two-dimensional antiferromagnetic SrCuOCl insulator using resonant x-ray scattering: evidence for extended interactions.
摘要：
We measured the momentum dependence of magnetic excitations in the model spin-1/2 2D antiferromagnetic insulator Sr2CuO2Cl2 (SCOC). We identify a single-spin-wave feature and a multimagnon continuum, with different polarization dependences. The spin waves display a large (70 meV) dispersion between the zone-boundary points (π, 0) and (π/2, π/2). Employing an extended t-t'-t''-U one-band Hubbard model, we find significant electronic hopping beyond nearest-neighbor Cu ions, indicative of extended magnetic interactions. The spectral line shape at (π, 0) indicates sizable quantum effects in SCOC and probably more generally in the cuprates.
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DOI：
http://dx.doi.org/10.1103/PhysRevLett.105.157006
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年份：
2010
APS
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