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Titolo:
COMPUTER-SIMULATION STUDY OF A 2-DIMENSIONAL NEMATOGENIC LATTICE MODEL WITH LONG-RANGE INTERACTIONS ISOTROPIC IN SPIN SPACE
Autore:
ANGELESCU N; ROMANO S; ZAGREBNOV VA;
Indirizzi:
UNIV PAVIA,INFM,DIPARTIMENTO FIS A VOLTA,VIA A BASSI 6 I-27100 PAVIA ITALY UNIV PAVIA,INFM,DIPARTIMENTO FIS A VOLTA I-27100 PAVIA ITALY KATHOLIEKE UNIV LEUVEN,INST THEORET FYS B-3001 HEVERLEE BELGIUM UNIV AIX MARSEILLE 2,CTR PHYS THEOR,DEPT PHYS,CNRS F-13288 MARSEILLE 09 FRANCE INST ATOM PHYS,DEPT THEORET PHYS R-76900 BUCHAREST ROMANIA
Titolo Testata:
International journal of modern physics b
fascicolo: 7, volume: 9, anno: 1995,
pagine: 859 - 873
SICI:
0217-9792(1995)9:7<859:CSOA2N>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONTE-CARLO SIMULATION; PLANE-ROTATOR SYSTEM; ORIENTATIONAL PHASE-TRANSITION; CLASSICAL HEISENBERG-SYSTEM; LEBWOHL-LASHER MODEL; 2 DIMENSIONS; FERROMAGNETIC INTERACTIONS; LIQUID-CRYSTALS; ANTIFERROMAGNETIC INTERACTIONS; SUMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
N. Angelescu et al., "COMPUTER-SIMULATION STUDY OF A 2-DIMENSIONAL NEMATOGENIC LATTICE MODEL WITH LONG-RANGE INTERACTIONS ISOTROPIC IN SPIN SPACE", International journal of modern physics b, 9(7), 1995, pp. 859-873

Abstract

We have considered a classical spin system, consisting of n-componentunit vectors (n = 2, 3) {u(k), k is an element of Z(d))}, associated with a d-dimensional lattice Z(d), d = 1, 2, and interacting via pair potentials, isotropic in spin space, and of the long-range form [GRAPHICS] Here epsilon is a positive constant setting energy and temperature scales (i.e. T = k(B)T/epsilon)) and x(k) denotes dimensionless lattice-site coordinates. Extending previous rigorous results, one can prove the existence of an ordering transition at finite temperature when0 < sigma < d, and its absence when sigma greater than or equal to d. We have studied the case defined by n = 3, d = 2, sigma = 1, by meansof computer simulation, Molecular Field and Two-Site Cluster theory. The Two-Site Cluster approach was found to bring about a recognizable improvement over Molecular Field; on the other hand, comparison with the Lebwohl-Lasher lattice model shows that the long-range character ofthe interaction tends to increase the transition temperature towards its Molecular Field limit.

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Documento generato il 24/10/20 alle ore 12:04:59