Low-energy excitations of a classical XY ferromagnetic chain in a transverse random field
Makaleler > Tam Makale · 1999
Yazarlar: İbrahim AVGIN
PHYSICAL REVIEW B, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 1999, cilt 59, ss 13554-13556
DOI: 10.1103/physrevb.59.13554
Özet
Low-energy excitations of a classical XY ferromagnetic chain in a random sign transverse held are investigated using the coherent-potential approximation (CPA). Near the critical field strength, the dynamics of the system is similar to that of the high-held spin-glass chain system investigated earlier. The CPA reproduced the anomalous dispersion law and nontrivial dynamic and crossover exponents which were obtained by the renormalization-group technique. The CPA also predicts an explicit form of the scaling function. For symmetric and asymmetric distributions of the field, different dynamics and exponents are obtained. A brief analysis is given about the thermodynamics of the system.