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Titolo:
COMPUTER-SIMULATION STUDY OF A DISORDERED ONE-DIMENSIONAL NEMATOGENICLATTICE MODEL WITH LONG-RANGE INTERACTIONS ISOTROPIC IN SPIN SPACE
Autore:
ROMANO S;
Indirizzi:
UNIV PAVIA,INFM,DIPARTIMENTO FIS A VOLTA,VIA A BASSI 6 I-27100 PAVIA ITALY
Titolo Testata:
International journal of modern physics b
fascicolo: 25, volume: 9, anno: 1995,
pagine: 3345 - 3354
SICI:
0217-9792(1995)9:25<3345:CSOADO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONTE-CARLO SIMULATION; PLANE-ROTATOR SYSTEM; ORIENTATIONAL PHASE-TRANSITION; CLASSICAL HEISENBERG-SYSTEM; MAIER-SAUPE MODEL; N-VECTOR MODEL; 2 DIMENSIONS; FERROMAGNETIC INTERACTIONS; CRITICAL EXPONENTS; LIQUID-CRYSTAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
S. Romano, "COMPUTER-SIMULATION STUDY OF A DISORDERED ONE-DIMENSIONAL NEMATOGENICLATTICE MODEL WITH LONG-RANGE INTERACTIONS ISOTROPIC IN SPIN SPACE", International journal of modern physics b, 9(25), 1995, pp. 3345-3354

Abstract

We have considered a classical spin system, consisting of 3-componentunit vectors, associated with a one-dimensional lattice (uk, Ic is anelement of Z), and interacting via translationally invariant pair potentials, isotropic in spin space, and of the long-range form W = W-jk = -epsilon\j - k\P--1-sigma(2)(tau), tau = tau(jk) = u(j) . u(k), sigma > O, where epsilon is a positive constant setting energy and temperature scales (i.e. T = k(B)T/epsilon). Extending previous rigorous results, one can prove the existence of an ordering transition at finite temperature when 0 < sigma < 1, and its absence when sigma greater than or equal to 1. We have studied the border case sigma = 1, by means of computer simulation. Similarly to the magnetic counterparts of the present model, we found evidence suggesting a transition to a low-temperature phase with slow decay of correlations and infinite susceptibility, i.e. a Berezhinskii-Kosterlitz-Thouless-like transition; the transition temperature was estimated to be Theta = 0.475 +/- 0.005.

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Documento generato il 20/09/20 alle ore 04:16:17