Magnons in tetragonal CuO

Moser, S.; Shaik, N.; Samal, D.; Fatale, S.; Dalla Piazza, B.; Dantz, M.; Pelliciari, J.; Olalde-Velasco, P.; Schmitt, T.; Koster, G.; Mila, F.; Ronnow, H.; Grioni, M.

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Magnons in tetragonal CuO

MPS-Authors

Samal, D.
Max Planck Society;

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Mila, F.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Moser, S., Shaik, N., Samal, D., Fatale, S., Dalla Piazza, B., Dantz, M., et al. (2015). Magnons in tetragonal CuO. Physical Review B, 92(14): 140404.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CB3A-D

Abstract

We investigate by resonant inelastic x-ray scattering the magnetic excitations in thin films of tetragonal CuO. We identify a spin wave excitation, dispersing on two cupratelike antiferromagnetic sublattices. Its energy at the boundary of the Brillouin zone (220 meV), is significantly lower than typical values (E similar to 300 meV) found in two-dimensional cuprates. A spin wave expansion starting from an extended Hubbard model suggests two possible scenarios for this energy lowering.