DOI: https://doi.org/10.30970/jps.03.81
SOFT MODE IN LOCALLY ANHARMONIC ‟φ3+φ4” MODEL
|
Journal of Physical Studies 3(1), 81–89 (1999)
DOI: https://doi.org/10.30970/jps.03.81 SOFT MODE IN LOCALLY ANHARMONIC ‟φ3+φ4” MODEL |
|
I. V. Stasyuk, K. O. Trachenko
Institute for Condensed Matter Physics
of the National Academy of Sciences of Ukraine,
1 Svientsitskyy Str., Lviv, UA-290011, Ukraine
The dynamics of collective vibrations in the locally anharmonic model is studied. The single ion problem is treated by numerical calculation while interaction between ions in different cells is accounted for in the random phase approximation. The density of vibrational states is obtained at various values of the temperature, single ion asymmetry field and wave vector. The existence in the spectrum of the soft mode whose energy comes to zero at the critical point is verified. The redistribution of intensities among various energy branches at the varying of the wave vector is studied.