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.; Ament, L. J. P.; van den Brink, J.; Lin, P.-H.; Xu, P.; Ronnow, H. M.; Grioni, M.
2010

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Abstract

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.

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Title Measurement of Magnetic Excitations in the Two-Dimensional Antiferromagnetic Sr2CuO2Cl2 Insulator Using Resonant X-Ray Scattering: Evidence for Extended Interactions
Author(s) 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. ; Ament, L. J. P. ; van den Brink, J. ; Lin, P.-H. ; Xu, P. ; Ronnow, H. M. ; Grioni, M.
Published in Physical Review Letters
Volume 105
Issue 15
Pages 157006
Date 2010
Publisher American Physical Society
ISSN 0031-9007
Keywords
DOI https://doi.org/10.1103/PhysRevLett.105.157006
Other identifier(s) View record in Web of Science
Laboratories LQM
LSE
Record Appears in Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LQM - Laboratory for Quantum Magnetism
Scientific production and competences > SB - School of Basic Sciences > SB Archives > LSE - Laboratory of Photoelectron Spectroscopy
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2011-03-16

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