New universality class for the three-dimensional XY model with correlated impurities: application to 4He in aerogels.
Phys Rev Lett
; 90(17): 170602, 2003 May 02.
Article
en En
| MEDLINE
| ID: mdl-12786062
ABSTRACT
Encouraged by experiments on 4He in aerogels, we confine planar spins in the pores of simulated aerogels (diffusion limited cluster-cluster aggregation) in order to study the effect of quenched disorder on the critical behavior of the three-dimensional XY model. Monte Carlo simulations and finite-size scaling are used to determine critical couplings K(c) and exponents. In agreement with experiments, clear evidence of change in the thermal critical exponents nu and alpha is found at nonzero volume fractions of impurities. These changes are explained in terms of hidden long-range correlations within disorder distributions.
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01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2003
Tipo del documento:
Article
País de afiliación:
Venezuela