title: Criticality of D=2 and D=3 Ising models: cluster structure versus populations.
abstract: The energy and the specific heat of two- and three-dimensional Ising systems are analyzed in terms of cluster properties. The energy and the specific heat are decomposed into two components, which are defined by quantities pertaining to cluster populations and cluster structure expressed in terms of average cluster perimeters. It is shown that the structural component of the energy as well as of the specific heat represents the dominant contribution. Indications are presented that the critical exponent of structural and populational components of specific heat matches the exponent of the entire specific heat.
authors.affiliation: National Institute of Chemistry, P.O. Box 3430, 1001 Ljubljana, Slovenia.
authors.forename: B
authors.initials: B
authors.lastname: Borstnik
authors.forename: D
authors.initials: D
authors.lastname: Lukman