Nonequilibrium phase transitions in one-dimensional kinetic Ising models

A family of nonequilibrium kinetic Ising models, introduced earlier, evolving under the competing effect of spin flips at {\it zero temperature} and nearest neighbour random spin exchanges is further investigated here. By increasing the range of spin exchanges and/or their strength the nature of the phase transition 'Ising-to-active' becomes of (dynamic) mean-field type and a first order tricitical point is located at the Glauber (

\delta=0

) limit. Corrections to mean-field theory are evaluated up to sixth order in a cluster approximation and found to give good results concerning the phase boundary and the critical exponent

\beta

of the order parameter which is obtained as

\beta\simeq1.0

.

Note:

15 pages, revtex file, figures available at request from odor@r1.atki.kfki.hu in postscript format, submitted to J.Phys.A

References(18)

Figures(0)

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