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Measurement of Magnetic Excitations in the Two-Dimensional Antiferromagnetic Sr2CuO2Cl2 Insulator Using Resonant X-Ray Scattering: Evidence for Extended Interactions

Guarise, M.; Dalla Piazza, B.; Sala, M. Moretti; Ghiringhelli, G.; Braicovich, L.; Berger, H.; Hancock, J. N.; van der Marel, D.; Schmitt, T.; Strocov, V. N.
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  • Published in: Physical Review Letters (ISSN: 0031-9007), vol. 105, num. 157006
  • American Physical Society, 2010

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 (pi, 0) and (pi/2, pi/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 (pi, 0) indicates sizable quantum effects in SCOC and probably more generally in the cuprates.

Keywords: Lamellar Copper Oxides ; Square-Lattice ; Heisenberg-Antiferromagnet ; Optical-Properties ; Raman-Scattering ; Spectra ; La2Cuo4 ; State

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Record created on 2011-03-16, modified on 2012-03-28

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