INVESTIGADORES
RAMIREZ PASTOR Antonio Jose
artículos
Título:
Thermodynamic Integration Method Applied to ± J Ising lattices
Autor/es:
F. ROMÁ; F. NIETO; A. J. RAMIREZ-PASTOR; E. E. VOGEL
Revista:
PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2005 vol. 348 p. 216 - 222
ISSN:
0378-4371
Resumen:
Square lattices with Ising spins at the sites and ±J exchangeinteractions between nearest neighbors are one of the realizationsof the Edwards Anderson model originally proposed to mimic spinglasses. Such systems produce a complex configuration space due tofrustration originated in local competing fields. Reaching exactresults for physical parameters is limited to the ground states ofsmall systems. Due to this complexity it is unavoidable to usenumerical methods subject to controlled error to attempt a goodapproximation for large enough systems. Here we make use of thethermodynamic integration method to obtain energy and remnantentropy for lattices 20x20 with variable concentration x offerromagnetic bonds. It turns out that both energy and entropyreach their minima at x = 0.0 and 1.0 growing towards thesymmetric point x = 0.5 in a similar way,leading to an almostlinear relationship between entropy and energy.
