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APS » Journals » Phys. Rev. Lett. » Volume 85 » Issue 1
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Phys. Rev. Lett. 85, 122–125 (2000)

Complex Phase Behavior Induced by Repulsive Interactions

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E. Velasco1, L. Mederos2, G. Navascués1, P. C. Hemmer3, and G. Stell4
1Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
2Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, E-28049 Madrid, Spain
3Institutt for Fysikk, NTNU, N-7491 Trondheim, Norway
4Department of Chemistry, State University of New York, Stony Brook, New York 11794-3400

Received 11 January 2000; published in the issue dated 3 July 2000

For a solid in which the interactions have a hard core plus a simple soft repulsive tail we show, using a perturbation theory, that the possible stable crystalline structures give rise to a rich phase behavior. We find two concomitant critical points each corresponding to phase transitions separating bcc and fcc structures, respectively, and the occurrence of a transition between fcc and bcc phases without change in density. This novel phenomenology may be relevant to the behavior of some metallic systems, colloids, and to water.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.122
DOI:
10.1103/PhysRevLett.85.122
PACS:
64.60.-i, 64.70.Dv, 64.70.Kb
 
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