Smearing of the phase transition in Ising systems with planar defects

Details Smearing of the phase transition in Ising systems with planar defects Smearing of the phase transition in Ising systems with planar defects

2003-03-27

arxiv.org/abs/cond-mat/0303598v2

J. Phys. A 36, 10291 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

15 pages, 5 figures, to appear in J. Phys. A

Scientific paper

10.1088/0305-4470/36/43/017

We show that phase transitions in Ising systems with planar defects, i.e., disorder perfectly correlated in two dimensions are destroyed by smearing. This is caused by effects similar to but stronger than the Griffiths phenomena: Exponentially rare spatial regions can develop true static long-range order even when the bulk system is still in its disordered phase. Close to the smeared transition, the order parameter is very inhomogeneous in space, with the thermodynamic (average) order parameter depending exponentially on temperature. We determine the behavior using extremal statistics, and we illustrate the results by computer simulations.

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