Nematic phase in two-dimensional frustrated systems with power-law decaying interactions
dc.contributor.author | Barci, Daniel G. | pt_BR |
dc.contributor.author | Ribeiro, Leonardo Rodrigues | pt_BR |
dc.contributor.author | Stariolo, Daniel Adrian | pt_BR |
dc.date.accessioned | 2014-08-26T09:26:20Z | pt_BR |
dc.date.issued | 2013 | pt_BR |
dc.identifier.issn | 1539-3755 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/101838 | pt_BR |
dc.description.abstract | We address the problem of orientational order in frustrated interaction systems as a function of the relative range of the competing interactions. We study a spin model Hamiltonian with short-range ferromagnetic interaction competing with an antiferromagnetic component that decays as a power law of the distance between spins, 1/rα. These systems may develop a nematic phase between the isotropic disordered and stripe phases.We evaluate the nematic order parameter using a self-consistent mean-field calculation. Our main result indicates that the nematic phase exists, at mean-field level, provided 0 < α < 4. We analytically compute the nematic critical temperature and show that it increases with the range of the interaction, reaching its maximum near α ∼ 0.5.We also compute a coarse-grained effective Hamiltonian for long wavelength fluctuations. For 0 < α < 4 the inverse susceptibility develops a set of continuous minima at wave vectors | k| = k0(α) which dictate the long-distance physics of the system. For α → 4, k0 → 0, making the competition between interactions ineffective for greater values of α. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. E, Statistical, nonlinear, and soft matter physics. Vol. 87, no. 6 (June 2013), 062119, 7 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Antiferromagnetismo | pt_BR |
dc.subject | Ferromagnetismo | pt_BR |
dc.subject | Modelo de ising | pt_BR |
dc.subject | Frustração (Física) | pt_BR |
dc.subject | Suscetibilidade magnética | pt_BR |
dc.subject | Hamiltonianos de spin | pt_BR |
dc.subject | Cálculos SCF | pt_BR |
dc.title | Nematic phase in two-dimensional frustrated systems with power-law decaying interactions | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000898229 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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