Spin-wave spectrum in doped nickelates
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences
Tel Aviv University - Tel Aviv 69978, Israel
Accepted: 22 January 1999
It is shown that extra holes in oxygen-doped nickelates form resonant levels near the bottom of the spin-wave band. Scattering of spin waves on these levels dramatically modifies the spin-wave spectrum. Well-defined spin waves with reduced velocities exist at low energies. Spin waves with energies close to the resonant level energy are strongly damped. At higher energies the effect of doping weakens, and the spin-wave velocity is almost the same as in the undoped nickelate. These results explain the peculiar properties of the spin-wave spectrum observed recently in .
PACS: 75.10.Jm – Quantized spin models / 75.30.Ds – Spin waves / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1999