Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 363, Issue 2, Pages 327-333Publisher
ELSEVIER
DOI: 10.1016/j.physa.2005.08.052
Keywords
lattice theory and statistics; spin-glass and other random models; phase transitions
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A novel order parameter Phi for spin glasses is defined based oil topological criteria and with a clear physical interpretation. Phi is first investigated for well known magnetic systems and then applied to the Edwards-Anderson +/- J model oil a square lattice, comparing its properties with the usual q order parameter. Finite size scaling procedures are performed. Results and analyses based on Phi confirm a zero temperature phase transition and allow to identify the low temperature phase. The advantages of Phi are brought out and its physical meaning is established. (c) 2005 Elsevier B.V. All rights reserved.
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