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Magnons in tetragonal CuO

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
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 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

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

Open Access

URL https://infoscience.epfl.ch/record/214059?ln=en
Type of Open Access Repository (Green Open Access)

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.
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