6533b7d7fe1ef96bd1268fc2
RESEARCH PRODUCT
Role of dimensionality in spontaneous magnon decay: easy-plane ferromagnet
M. E. ZhitomirskyV. A. Stephanovichsubject
PhysicsCondensed Matter - Materials ScienceCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Condensed Matter::OtherMagnonMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsBrillouin zoneTetragonal crystal systemCondensed Matter::Materials ScienceCondensed Matter - Strongly Correlated ElectronsFerromagnetismSpin waveLattice (order)Quantum electrodynamicsCondensed Matter::Strongly Correlated ElectronsZero temperature[PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]Curse of dimensionalitydescription
We calculate magnon lifetime in an easy-plane ferromagnet on a tetragonal lattice in transverse magnetic field. At zero temperature magnons are unstable with respect to spontaneous decay into two other magnons. Varying ratio of intrachain to interchain exchanges in this model we consider the effect of dimensionality on spontaneous magnon decay. The strongest magnon damping is found in the quasi-one-dimensional case for momenta near the Brillouin zone boundary. The sign of a weak interchain coupling has a little effect on the magnon decay rate. The obtained theoretical results suggest possibility of experimental observation of spontaneous magnon decay in a quasi-one-dimensional ferromagnet CsNiF$_3$. We also find an interesting enhancement of the magnon decay rate for a three-dimensional ferromagnet. The effect is present only for the nearest-neighbor model and is related to effective dimensionality reduction in the two-magnon continuum.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-06-01 |