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Observation of Two Nondispersive Magnetic Excitations in NiO by Resonant Inelastic Soft-X-Ray Scattering
- Source :
- Physical Review Letters. 102
- Publication Year :
- 2009
- Publisher :
- American Physical Society (APS), 2009.
-
Abstract
- We present high resolution (DeltaE=120 meV) resonant inelastic x-ray scattering data measured at the Ni L3 edge (2p_{3/2}--3d) on the paradigmatic antiferromagnetic oxide NiO. Spectra reveal clear signatures of magnetic excitations at approximately 95 and approximately 190 meV whose energy seems independent from transferred momentum. These spectral features are well reproduced by a single Ni2+ ion model in an effective exchange field. Within this local model the two magnetic excitations are characterized by a variation of the atomic magnetic moment along the local ordering direction (DeltaS_{alpha}) of one and two units. The DeltaS_{alpha}=2 case has different nature from bimagnons observed in optical Raman spectra, for which DeltaS_{alpha}=0.
- Subjects :
- Physics
Condensed matter physics
Magnetic moment
Wave Dispersion
Scattering
General Physics and Astronomy
Inelastic scattering
Spectral line
Inelastic neutron scattering
Resonant inelastic X-ray scattering
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X-ray Raman scattering
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Atomic physics
Optical-Absorption
Raman-Scattering
Raman scattering
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 102
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....8d7e781131f48674c8e6eb3724499d56