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

B. W. Lebert, M. P.M. Dean, A. Nicolaou, J. Pelliciari, M. Dantz, T. Schmitt, R. Yu, M. Azuma, J. P. Castellan, H. Miao, A. Gauzzi, B. Baptiste, M. D'Astuto

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6 Scopus citations

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.

Original languageEnglish
Article number155110
JournalPhysical Review B
Volume95
Issue number15
DOIs
StatePublished - Apr 7 2017
Externally publishedYes

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