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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/8197

Title: Short-range Ising spin glasses: a critical exponent study
Other Titles: Physica A: Statistical Mechanics and its Applications
Authors: Nogueira Júnior, E.
Coutinho, Sérgio
Nobre, F. D.
Curado, E. M. F.
Keywords: Spin glasses;Short range interactions;Critical exponents
Issue Date: 1998
Abstract: The critical properties of short-range Ising spin-glass models, defined on diamond hierarchical lattices of graph fractal dimensions df=2.58,3, and 4, and scaling factor 2, are studied via a method based on the Migdal–Kadanoff renormalization-group scheme. The order-parameter critical exponent β is directly estimated from the data of the local Edwards–Anderson (EA) order parameter, obtained through an exact recursion procedure. The scaling of the EA order parameter, leading to estimates of the ν exponent of the correlation length is also performed. Four distinct initial distributions of the quenched coupling constants (Gaussian, bimodal, uniform and exponential) are considered. Deviations from a universal behavior are observed and analysed in the framework of the renormalized flow in a two-dimensional appropriate parameter space.
Description: Texto completo: acesso restrito. p.365–370
URI: http://www.repositorio.ufba.br/ri/handle/ri/8197
ISSN: 0378-4371
Appears in Collections:Artigos Publicados em Periódicos (FIS)

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