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metadata.dc.type: | Artigo de Periódico |
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. |
metadata.dc.creator: | Nogueira Júnior, E. Coutinho, Sérgio Nobre, F. D. Curado, E. M. F. |
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. |
Keywords: | Spin glasses Short range interactions Critical exponents |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/8197 |
Issue Date: | 1998 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
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Nogueira.pdf Restricted Access | 69,72 kB | Adobe PDF | View/Open Request a copy |
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