Phase Transitions without Thermodynamic Limit

Details Phase Transitions without Thermodynamic Limit Phase Transitions without Thermodynamic Limit

1998-12-08

arxiv.org/abs/cond-mat/9812120v1

Physics

Condensed Matter

Latex, 12 pages including 2 .eps figures included in *.tar.gz.-file. Presented at Les Houches 31.3-10.4.98, My E-mail address:

Scientific paper

Microcanonical statistics can be well applied to non-extensive systems like nuclei, atomic clusters and systems at phase transitions of first order with inhomogeneous configurations like phase separation. No thermodynamic limit has to be invoked. It allows to determine the transition temperature, latent heat and surface entropy. In the present paper this is demonstrated for systems of 200 - 3000 Na-, K-, and Fe-atoms at 1 atmosphere. As the energy is an exactly conserved quantity it is a usefull control parameter to tune through the development of the transition from the liquid side of the coexistence region over the evaporation, multifragmentation towards the final gas side. Microcanonical thermodynamics thus resolves details of the mechanism leading to the phase transition.

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