Surface criticality in random field magnets

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2005
Major/Subject
Mcode
Degree programme
Language
en
Pages
214416/1-6
Series
Physical Review B, Volume 72, Issue 21
Abstract
The boundary-induced scaling of three-dimensional random field Ising magnets is investigated close to the bulk critical point by exact combinatorial optimization methods. We measure several exponents describing surface criticality: β1 for the surface layer magnetization and the surface excess exponents for the magnetization and the specific heat, βs and αs. The latter are related to the bulk phase transition by the same scaling laws as in pure systems, but only with the same violation of the hyperscaling exponent θ as in the bulk. The boundary disorders faster than the bulk, and the experimental and theoretical implications are discussed.
Description
Keywords
random field Ising magnets, boundary-induced scaling
Other note
Citation
Laurson, L. & Alava, Mikko J. 2005. Surface criticality in random field magnets. Physical Review B. Volume 72, Issue 21. 214416/1-6. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.72.214416.