Abstract
Detailed spin-wave spectra of magnetoelectric LiNiPO4 have been measured by neutron scattering at low temperatures in the commensurate (C) antiferromagnetic (AF) phase below T-N=20.8 K. An anomalous shallow minimum is observed at the modulation vector of the incommensurate (IC) AF phase appearing above T-N. A linear spin-wave model based on Heisenberg exchange couplings and single-ion anisotropies accounts for all the observed spin-wave dispersions and intensities. Along the b axis an unusually strong next-nearest-neighbor AF coupling competes with the dominant nearest-neighbor AF exchange interaction and causes the IC structure.
| Original language | English |
|---|---|
| Journal | Physical Review B Condensed Matter |
| Volume | 79 |
| Issue number | 9 |
| Pages (from-to) | 092413 |
| ISSN | 0163-1829 |
| DOIs | |
| Publication status | Published - 2009 |
Bibliographical note
Copyright 2009 American Physical SocietyKeywords
- commensurate-incommensurate transformations
- magnetoelectric effects
- exchange interactions (electron)
- Materials research
- Materials characterization and modelling
- Heisenberg model
- nickel compounds
- lithium compounds
- magnetic anisotropy
- neutron diffraction
- antiferromagnetic materials
- magnetic transitions
- spin waves
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