Phase transitions in one dimension and less

Details Phase transitions in one dimension and less Phase transitions in one dimension and less

2002-02-08

arxiv.org/abs/cond-mat/0202129v1

Nucl.Phys. B639 (2002) 411-428

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 1 figure

Scientific paper

10.1016/S0550-3213(02)00481-9

Phase transitions can occur in one-dimensional classical statistical mechanics at non-zero temperature when the number of components N of the spin is infinite. We show how to solve such magnets in one dimension for any N, and how the phase transition develops at N = infinity. We discuss SU(N) and Sp(N) magnets, where the transition is second-order. In the new high-temperature phase, the correlation length is zero. We also show that for the SU(N) magnet on exactly three sites with periodic boundary conditions, the transition becomes first order.

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