Naslov
Critical scaling in random-field systems : 2 or 3 independent exponents?

Autori
Tarjus, Gilles ; Balog, Ivan ; Tissier, Matthieu

Izvornik
Europhysics Letters (0295-5075) 103 (2013), 6; 61001-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, pismo, znanstveni

Ključne riječi
critical phenomena; nonperturbative renormalization group; systems with disorder

Sažetak
We show that the critical scaling behavior of random-field systems with short-range interactions and disorder correlations cannot be described in general by only two independent exponents, contrary to previous claims. This conclusion is based on a theoretical description of the whole (d, N) domain of the d-dimensional random-field O(N) model (RFO(N)M) and points to the role of rare events that are overlooked by the proposed derivations of two-exponent scaling. Quite strikingly, however, the numerical estimates of the critical exponents of the random-field Ising model are extremely close to the predictions of the two-exponent scaling in d = 3 and d = 4, so that the issue cannot be decided only on the basis of numerical simulations in these spatial dimensions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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