The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order

Details The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order

2005-03-15

arxiv.org/abs/cond-mat/0503364v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Nature of Vibrations of a 2-D Disordered Lattice Model with Nano-scale Order will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-316131