Strongly asymmetric tricriticality of quenched random-field systems

Kabakcioglu A., Berker A.

PHYSICAL REVIEW LETTERS, vol.82, no.12, pp.2572-2574, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82 Issue: 12
  • Publication Date: 1999
  • Doi Number: 10.1103/physrevlett.82.2572
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2572-2574
  • Istanbul Technical University Affiliated: No


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 magnetic 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 phase transitions more effectively than random bonds. The coexistence region is extremely flat, attesting to an unusually small tricritical exponent beta(u). The random-field phase diagram is strikingly asymmetric. To accommodate this asymmetry, the second-order boundary exhibits reentrance. [S0031-9007(99)08751-7].