Navegação Ciências Exatas e da Terra por Assunto "Modelo x-y"
Resultados 1-4 de 4
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Competing nematic interactions in a generalized XY model in two and three dimensions
(2016) [Artigo de periódico]We study a generalization of the XY model with an additional nematic-like term through extensive numerical simulations and finite-size techniques, both in two and three dimensions. While the original model favors local ... -
New ordered phases in a class of generalized XY models
(2011) [Artigo de periódico]It is well known that the 2D XY model exhibits an unusual infinite order phase transition belonging to the Kosterlitz-Thouless (KT) universality class. Introduction of a nematic coupling into the XY Hamiltonian leads to ... -
Pairing transition, coherence transition, and the irreversibility line in granular GdBa/sub 2/Cu/sub 3/O/sub 7-[delta]/
(2000) [Artigo de periódico]We report on electrical magnetoconductivity experiments near the superconducting transition of a granular sample of GdBa₂Cu₃O₇₋₈. The measurements were performed in magnetic fields ranging from 0 to 500 Oe applied parallel ... -
Quasistationary trajectories of the mean-field XY Halmitonian model : a topological perspective
(2005) [Artigo de periódico]We employ a topological approach to investigate the nature of quasistationary states of the mean-field XY Hamiltonian model. We focus on the quasistationary states reached when the system is initially prepared in a fully ...