The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order
| dc.creator | Ghosh, Prasenjit | |
| dc.creator | Waghmare, Umesh V. | |
| dc.date | 2005-03-15 | |
| dc.date.accessioned | 2026-07-07T03:04:11Z | |
| dc.date.available | 2026-07-07T03:04:11Z | |
| dc.description | Motivated by the unusual soft mode anomalies in the relaxor ferroelectrics, we present a numerical study of vibrational excitations of a disordered lattice model with chemical order on the nano-scale. We find an Ioffe-Regel crossover in acoustic modes separating propagating low-frequency modes from the intermediate frequency diffusons, and localized modes at the high-frequency end of the spectrum. At a fixed degree of disorder, we find increasing uncertainty in the momentum of long wave-length optical modes with decrease in the size of nano-ordered regions. We determine the cause for this to be a strong mixing between acoustic and optical modes, believed to be central to the model of waterfall phonon anomalies. | |
| dc.description | 4 pages, 4 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0503364 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0503364 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/26038 | |
| dc.subject | Materials Science | |
| dc.title | The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order | |
| dc.type | text |