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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., Rønnow H. M., Grioni M.,
Project Coupled spin, charge and orbital dynamics of low-dimensional cuprates
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 92(14)
Page(s) 140404(R)
Title of proceedings Physical Review B
DOI 10.1103/physrevb.92.140404


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∼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.