Abstract:
As a system is diluted, the critical temperature Tc may fall to zero at a concentration xc greater than the percolation concentration pc, because mere connectivity does not guarantee the transmission of order even at T=0. Detailed results, including bounds on xc, are presented for the three-state Potts antiferromagnet on a triangular lattice and for quadrupolar models of (o-H2)x(p-H2)1-x hydrogen mixtures on fcc and triangular lattices. © 1987 The American Physical Society.
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