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.
Resonant inelastic x-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2 / 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.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 95:15(2017), pp. 1-7. [10.1103/physrevb.95.155110]
Resonant inelastic x-ray scattering study of spin-wave excitations in the cuprate parent compound Ca2CuO2Cl2
Pelliciari, J.;
2017
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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