Treffer: Universality in random systems : the case of the 3D random field Ising model

Title:
Universality in random systems : the case of the 3D random field Ising model
Authors:
SOURLAS, N
Source:
Proceedings of the Europhysics Conference on Computational Physics CCP 1998 Modeling Collective Phenomena in Complex SystemsComputer physics communications. 121-22:183-187
Publisher Information:
Amsterdam: Elsevier Science, 1999.
Publication Year:
1999
Physical Description:
print, 12 ref
Original Material:
INIST-CNRS
Subject Terms:
Computer science, Informatique, Theoretical physics, Physique théorique, Sciences exactes et technologie, Exact sciences and technology, Physique, Physics, Generalites, General, Physique statistique, thermodynamique, et systèmes dynamiques non linéaires, Statistical physics, thermodynamics, and nonlinear dynamical systems, Fluctuations, processus stochastiques, bruit, et mouvement brownien, Fluctuation phenomena, random processes, noise, and brownian motion, Théorie et statistique des réseaux (ising, potts, etc.), Lattice theory and statistics (ising, potts, etc.), Instruments, appareillage, composants et techniques communs à plusieurs branches de la physique et de l'astronomie, Instruments, apparatus, components and techniques common to several branches of physics and astronomy, Informatique en physique expérimentale, Computers in experimental physics, Modélisation et simulation par ordinateur, Computer modeling and simulation, Fluctuation phenomena, random processes, noise, and Brownian motion, Lattice theory and statistics (Ising, Potts, etc.), Champ aléatoire, Random field, Campo aleatorio, Classe universalité, Universality class, Clase universalidad, Etude théorique, Theoretical study, Loi probabilité, Probability distribution, Ley probabilidad, Modèle 3 dimensions, Three dimensional model, Modelo 3 dimensiones, Modèle Ising, Ising model, Système désordonné, Disordered systems
Document Type:
Konferenz Conference Paper
File Description:
text
Language:
English
Author Affiliations:
Laboratoire de Physique Théorique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France
ISSN:
0010-4655
Access URL:
http://pascal-francis.inist.fr/vibad/index.php?action=search&terms=1228047
Rights:
Copyright 2000 INIST-CNRS
CC BY 4.0
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS
Notes:
Metrology

Theoretical physics
Accession Number:
edscal.1228047
Database:
PASCAL Archive

Weitere Informationen

We study numerically the zero temperature Random Field Ising Model on cubic lattices of various linear sizes 6 ≤ L ≤ 90 in three dimensions with the purpose of verifying the validity of universality for disordered systems. For each random held configuration we vary the ferromagnetic coupling strength J and compute the ground state exactly. We examine the case of different random field probability distributions: Gaussian distribution, zero width bimodal distribution hi = ±1, wide bimodal distribution hi = ±1 + δh (with a Gaussian δh). We also study the case of the randomly-diluted antiferromagnet in a field, which is thought to be in the same universality class. We find that in the infinite volume limit the magnetization is discontinuous in J and we compute the relevant exponent, which, according to finite size scaling, equals 1/ν. We find different values of ν for the different random field distributions, in disagreement with universality.