Strongly Asymmetric Tricriticality of Quenched Random-Field Systems

A. Kabakcioglu; A. N. Berker

doi:10.1103/physrevlett.82.2572

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Strongly Asymmetric Tricriticality of Quenched Random-Field Systems

A. Kabakcioglu·A. N. Berker

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Abstract

In view of the recently seen dramatic effect of quenched random bonds on tricritical systems, we have conducted a renormalization-group study on the effect of quenched random fields on the tricritical phase diagram of the spin-1 Ising model in $d=3$. We find that random fields convert first-order phase transitions into second-order, in fact more effectively than random bonds. The coexistence region is extremely flat, attesting to an unusually small tricritical exponent $β_u$; moreover, an extreme asymmetry of the phase diagram is very striking. To accomodate this asymmetry, the second-order boundary exhibits reentrance.

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A. Kabakcioglu, A. N. Berker. 1998-11-17. Strongly Asymmetric Tricriticality of Quenched Random-Field Systems. https://doi.org/10.1103/physrevlett.82.2572

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