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Resonant inelastic x-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Lebert B. W., Dean M. P. M., Nicolaou A., Pelliciari J., Dantz M., Schmitt T., Yu R., Azuma M., Castellan J.-P., Miao H., Gauzzi A., Baptiste B., d'Astuto M.,
Project Coupled spin, charge and orbital dynamics of low-dimensional cuprates
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 95(15)
Page(s) 155110 - 155110
Title of proceedings Physical Review B
DOI 10.1103/physrevb.95.155110

Open Access

URL https://export.arxiv.org/abs/1610.08383
Type of Open Access Repository (Green Open Access)

Abstract

By means of resonant inelastic x-ray scattering at the Cu L3 edge, we measured the spin-wave dispersion along ⟨100⟩ and ⟨110⟩ in the undoped cuprate Ca2CuO2Cl2. The data yield a reliable estimate of the superexchange parameter J=135±4 meV using a classical spin-1/2 two-dimensional Heisenberg model with nearest-neighbor interactions and including quantum fluctuations. Including further exchange interactions increases the estimate to J=141 meV. The 40 meV dispersion between the magnetic Brillouin zone boundary points (1/2, 0) and (1/4, 1/4) indicates that next-nearest-neighbor interactions in this compound are intermediate between the values found in La2CuO4 and Sr2CuO2Cl2. Due to the low-Z elements composing Ca2CuO2Cl2, the present results may enable a reliable comparison with the predictions of quantum many-body calculations, which would improve our understanding of the role of magnetic excitations and of electronic correlations in cuprates.
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