Strongly Asymmetric Tricriticality of Quenched Random-Field Systems
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- Feza Guersey Research Center for Basic Sciences, Cengelkoey, Istanbul 81220 (Turkey)
- Department of Physics, Istanbul Technical University, Maslak, Istanbul 80626 (Turkey)
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}{sub u} . The random-field phase diagram is strikingly asymmetric. To accommodate this asymmetry, the second-order boundary exhibits reentrance. {copyright} {ital 1999} {ital The American Physical Society}
- DOE Contract Number:
- FG02-92ER45473
- OSTI ID:
- 321995
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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