Abstract
The dynamical-excitation spectrum of a diluted antiferromagnet is studied in the effective-medium approximation. Recent results based upon this approximation are revised and a detailed analysis of the structure factor for neutron scattering is carried out and evaluated numerically. The spectrum reveals a sharp crossover from extended to localized excitations at a crossover frequency, c(p-pc)3/2, where p is the percolation concentration and pc is the percolation threshold of the diluted antiferromagnet. The results are compared with recent neutron-diffraction experiments and with the scaling model for fractons.
| Original language | English |
|---|---|
| Pages (from-to) | 9353-9359 |
| Number of pages | 7 |
| Journal | Physical Review B |
| Volume | 39 |
| Issue number | 13 |
| DOIs | |
| State | Published - 1 Jan 1989 |
| Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics