Issue |
Europhys. Lett.
Volume 46, Number 1, April I 1999
|
|
---|---|---|
Page(s) | 82 - 87 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00550-y | |
Published online | 01 September 2002 |
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
Received:
11
November
1998
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
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