ON THE INTRINSIC MECHANISM OF THE CENTRAL-PEAK PHENOMENA NEAR FERROELECTRIC PHASE-TRANSITIONS

Citation
Vb. Kokshenev et As. Chaves, ON THE INTRINSIC MECHANISM OF THE CENTRAL-PEAK PHENOMENA NEAR FERROELECTRIC PHASE-TRANSITIONS, Journal of physics. Condensed matter, 7(27), 1995, pp. 5371-5382
Citations number
41
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
09538984
Volume
7
Issue
27
Year of publication
1995
Pages
5371 - 5382
Database
ISI
SICI code
0953-8984(1995)7:27<5371:OTIMOT>2.0.ZU;2-7
Abstract
A new microscopic analysis of the central-peak phenomena caused by the rmal fluctuations near the order-disorder phase transitions is given. This is based on new results obtained recently in the dynamics of the disordered phase of ferroelectrics in the framework of the three-dimen sional spin-1/2 Ising model in a transverse field and performed by the Green function method. A microscopic description for all the paramete rs of a phenomenological model adopted in the central-peak problem is given. In particular, the central-peak observation conditions are form ulated. A new critical behaviour of the central relaxation-type mode, namely gamma(c) similar to (T - T-c)(5/4) is found. A minimum of the s oft mode is predicted above the critical temperature T-c.