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RESEARCH PRODUCT
The Lineshape of Inelastic Neutron Scattering in Relaxor Ferroelectrics
A. WeronVladimir A. StephanovichA. WymysłowskiT. PiesiewiczM. KozlowskiM. A. Ivanovsubject
PhysicsCondensed Matter::Materials ScienceLatin hypercube sampling methodSolid-state physicsCondensed matter physicsImpurityPhononDrop (liquid)Condensed Matter PhysicsInelastic neutron scatteringElectronic Optical and Magnetic Materialsdescription
We show that a microscopic reason for the steep drop of the optical phonon branch into an acoustic one (the so-called waterfall effect) in relaxor ferroelectrics may be the coupling of phonons with defects and impurities of different kinds, which is always present in relaxors. Namely, we do not specify the type of impurities but rather represent them as an ensemble of so-called two-level systems (TLS). This approach makes it possible to trace the evolution of the “waterfall” with temperature and the TLS concentration. To facilitate the planning of experiments on inelastic neutron scattering, we present a modification of the so-called Latin hypercube sampling method, which, based on some significance criteria, allows one to perform measurements that are highly significant for elucidating the physical nature of, e.g., phonon dispersion laws in relaxor ferroelectrics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 | Physics of the Solid State |