Microscopic approach to orientational order of domain walls
dc.contributor.author | Barci, Daniel G. | pt_BR |
dc.contributor.author | Stariolo, Daniel Adrian | pt_BR |
dc.date.accessioned | 2014-10-14T02:13:08Z | pt_BR |
dc.date.issued | 2011 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104531 | pt_BR |
dc.description.abstract | We develop a fully microscopic, statistical mechanics approach to study phase transitions in Ising systems with competing interactions at different scales. Our aim is to consider orientational and positional order parameters in a unified framework. In this paper, we consider two-dimensional stripe-forming systems, where nematic, smectic, and crystal phases are possible.We introduce a nematic order parameter in a lattice, which measures orientational order of interfaces. We develop a mean-field approach that leads to a free energy, which is a function of both the magnetization (density) and the orientational (nematic) order parameters. Self-consistent equations for the order parameters are obtained and the solutions are described for a particular system, the dipolar frustrated Ising ferromagnet.We show that this system has an Ising-nematic phase at low temperatures in the square lattice, where positional order (staggered magnetization) is zero. At lower temperatures, a crystal-stripe phase may appear. In the continuum limit, the present approach connects to a Ginsburg-Landau theory, which has an isotropic-nematic phase transition with breaking of a continuous symmetry. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 84, no. 9 (Sep. 2011), 094439, 9 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Física da matéria condensada | pt_BR |
dc.subject | Mecânica estatística | pt_BR |
dc.subject | Paredes de domínios magnéticos | pt_BR |
dc.subject | Materiais ferromagnéticos | pt_BR |
dc.subject | Transições magnéticas | pt_BR |
dc.subject | Filmes finos magneticos | pt_BR |
dc.subject | Modelo de ising | pt_BR |
dc.subject | Energia livre | pt_BR |
dc.subject | Cobre | pt_BR |
dc.subject | Ferro | pt_BR |
dc.title | Microscopic approach to orientational order of domain walls | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000794726 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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