Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-12-16
Physical Review E 74, 021114 (2006)
Physics
Condensed Matter
Statistical Mechanics
Final version, accepted for publication in Physical Review E
Scientific paper
10.1103/PhysRevE.74.021114
The statistics of critical spin-spin correlation functions in Ising systems with non-frustrated disorder are investigated on a strip geometry, via numerical transfer-matrix techniques. Conformal invariance concepts are used, in order to test for logarithmic corrections to pure power-law decay against distance. Fits of our data to conformal-invariance expressions, specific to logarithmic corrections to correlations on strips, give results with the correct sign, for the moments of order $n=0-4$ of the correlation-function distribution. We find an interval of disorder strength along which corrections to pure-system behavior can be decomposed into the product of a known $n$-dependent factor and an approximately $n$-independent one, in accordance with predictions. A phenomenological fitting procedure is proposed, which takes partial account of subdominant terms of correlation-function decay on strips. In the low-disorder limit, it gives results in fairly good agreement with theoretical predictions, provided that an additional assumption is made.
de Queiroz L. A. S.
Lessa Jean C.
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