Investigating the phase diagram of finite extensive and nonextensive systems.
Microcanonical caloric curves at constant pressure and pressure versus volume curves at constant temperature are calculated using the probability distributions of a canonical ensemble at constant pressure. It is evidenced that the constant pressure path provides a natural order parameter even for small systems. While for large systems the Coulomb interaction is destroying the liquid-gas phase transition, for smaller systems the phase transition survives. Phase diagrams of a nuclear system without Coulomb and hard-core interactions are constructed and the critical point is identified.
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Laboratoire de Physique Corpusculaire Caen IN2P3-CNRS/ISMRA, F-14050 Caen Cedex, France.
Raduta
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