Pregled bibliografske jedinice broj: 1009921
Expansion around the mean field in quantum magnetic systems
Expansion around the mean field in quantum magnetic systems // Journal of Statistical Physics, 115 (2004), 1-2; 125-142 doi:10.1023/B:JOSS.0000019837.56894.8a (međunarodna recenzija, članak, ostalo)
CROSBI ID: 1009921 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Expansion around the mean field in quantum magnetic systems
Autori
De Pasquale, F. ; Giampaolo, S. M.
Izvornik
Journal of Statistical Physics (0022-4715) 115
(2004), 1-2;
125-142
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, ostalo
Ključne riječi
mean field
Sažetak
We introduce a new definition of ordered phase in a magnetic system based on properties of the local spin state probability. A statistical functional associated to this quantity depends both on amplitude and direction of the local magneti- zation. We show that it is possible to introduce an expansion at fixed magneti- zation amplitude in the inverse of lattice coordination number if the direction is selected by an extremum condition. In the limit of infinite coordination number we recover the mean field results. First order corrections are derived for the Ising model in the presence of a transverse field and for the XY model. Our results concerning critical temperature and order parameter compare favorably with other approaches.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
