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Existence of an ordered phase for the repulsive lattice gas on the FCC lattice

O J Heilmann

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It is proven by Peierls' argument in connection with reflection positivity that the lattice gas on the FCC lattice with nearest-neighbour repulsion (with interaction energy a) exists in an ordered state at low enough temperature provided the chemical potential, mu , satisfies 0< mu <4a, 4a< mu <8a or 8a< mu <12a. This result immediately carries over to the antiferromagnetic Ising model and the lattice gas with nearest-neighbour exclusion on the FCC lattice, both of which will also exist in an ordered state under suitable circumstances. In particular, the existence of a phase transition at zero magnetic field is confirmed.


PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

75.10.Hk Classical spin models

64.60.Cn Order–disorder transformations

MSC

82B26 Phase transitions (general)

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Statistical physics and nonlinear systems

Dates

Issue 5 (1 May 1980)



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