Inequivalence of ensembles in a system with long range interactions

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dc.creatorBarre', Julien
dc.creatorMukamel, David
dc.creatorRuffo, Stefano
dc.date2001-02-02
dc.date.accessioned2026-07-07T11:57:33Z
dc.date.available2026-07-07T11:57:33Z
dc.descriptionWe study the global phase diagram of the infinite range Blume-Emery-Griffiths model both in the canonical and in the microcanonical ensembles. The canonical phase diagram is known to exhibit first order and continuous transition lines separated by a tricritical point. We find that below the tricritical point, when the canonical transition is first order, the phase diagrams of the two ensembles disagree. In this region the microcanonical ensemble exhibits energy ranges with negative specific heat and temperature jumps at transition energies. These results can be extended to weakly decaying nonintegrable interactions.
dc.descriptionRevtex, 4 pages with 3 figures, submitted to Phys. Rev. Lett., e-mail ruffo@avanzi.de.unifi.it
dc.identifierhttps://arxiv.org/abs/cond-mat/0102036
dc.identifierhttp://arxiv.org/abs/cond-mat/0102036
dc.identifierPhys.Rev.Lett.87:030601,2001
dc.identifierdoi:10.1103/PhysRevLett.87.030601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205921
dc.subjectStatistical Mechanics
dc.titleInequivalence of ensembles in a system with long range interactions
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