Resonant inelastic X-ray scattering study of spin-wave excitations in the cuprate parent compound Ca${}_2$CuO${}_2$Cl${}_2$

Abstract

By means of resonant inelastic x-ray scattering at the Cu L${}_3$ edge, we measured the spin wave dispersion along $⟨$100$⟩$ and $⟨$110$⟩$ in the undoped cuprate Ca${}_2$CuO${}_2$Cl${}_2$. The data yields a reliable estimate of the superexchange parameter $J$ = 135 $\pm$ 4 meV using a classical spin-1/2 2D 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 La${}_2$CuO${}_4$ and Sr${}_2$CuO${}_2$Cl${}_2$. Owing to the low-$Z$ elements composing Ca${}_2$CuO${}_2$Cl${}_2$, 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.

8 pages, 6 figures

References in corpus (8)

• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
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Cited by in corpus (5)

• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
• Paramagnons and high-temperature superconductivity in mercury-based cuprates
• Orbital polarization, charge transfer, and fluorescence in reduced valence nickelates
• Paramagnon dispersion and damping in doped Na${}_x$Ca${}_{2-x}$CuO${}_2$Cl${}_2$
• Magnetic excitations in Nd${}_{n+1}$Ni${}_n$O${}_{3n+1}$ Ruddlesden-Popper nickelates observed via resonant inelastic x-ray scattering