Volume 55, Number 3, August 2001
|Page(s)||362 - 368|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Field-induced anti-nematic ordering in assemblies of anisotropically polarizable particles
INFM, Dipartimento di Fisica, Politecnico di Milano -
20133 Milano, Italy
2 INFM, Dipartimento di Elettronica, Università di Pavia - 27100 Pavia, Italy
3 INFM, Dipartimento di Informatica e Sistemistica Università di Pavia - 27100 Pavia, Italy
4 INFM, Dipartimento di Medicina Sperimentale Università di Milano Bicocca - 20052 Monza, Italy
5 INFM, SISSA - via Beirut 4, 34014 Trieste, Italy
Accepted: 28 May 2001
We have investigated the effects of dipolar interactions in a lattice system of anisotropically polarizable particles in the presence of an external field both by Monte Carlo computer simulations and through a mean-field analysis. In a specific range of low temperature, large external field and large particle density, a novel staggered nematic structure is found, in which two intercalated sublattices have different nematic order parameters. First- and second-order phase transition lines, connected at a tricritical point, enclose the anti-nematic phase in the temperature-density plane.
PACS: 64.60.Fr – Equilibrium properties near critical points, critical exponents / 82.70.Dd – Colloids
© EDP Sciences, 2001
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