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Magnons in tetragonal CuO

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Moser S., Shaik N. E., Samal D., Fatale S., Dalla Piazza B., Dantz M., Pelliciari J., Olalde-Velasco P., Schmitt T., Koster G., Mila F., Ronnow H. M., Grioni M.,
Project Quantum Magnetism - Spinons, Skyrmions and Dipoles
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Original article (peer-reviewed)

Volume (Issue) 92(14)
Page(s) 140404
Title of proceedings PHYSICAL REVIEW B
DOI 10.1103/physrevb.92.140404

Open Access

Type of Open Access Repository (Green Open Access)


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.