Critical exponents of the random-field O(N) model.
Journal Article
·
· Phys. Rev. Lett.
The critical behavior of the random-field Ising model has long been a puzzle. Different methods predict that its critical exponents in D dimensions are the same as in the pure (D-2)-dimensional ferromagnet with the same number of the magnetization components contrary to the experiments and simulations. We calculate the exponents of the random-field O(N) model with the (4+{epsilon})-expansion and obtain values different from the exponents of the pure ferromagnet in 2+{epsilon} dimensions. An infinite set of relevant operators missed in previous studies leads to a breakdown of the (6-{epsilon})-expansion.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; OUS
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949637
- Report Number(s):
- ANL/MSD/JA-42754
- Journal Information:
- Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: Apr. 29, 2002 Vol. 88; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- ENGLISH
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