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.
Magnons in tetragonal CuO / 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.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 92:14(2015), pp. 1-5. [10.1103/physrevb.92.140404]
Magnons in tetragonal CuO
Pelliciari, J.;
2015
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∼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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