New universality class for the three-dimensional XY model with correlated impurities: Application to ⁴He in aerogels

Abstract:

Clear changes of criticality in the three-dimensional XY model (3DXY) model is found when confined in diffusion limited cluster-clusster aggregation (DLCA) aerogel at different porositie. Evidence of long-range correlated structures within DLCA aggregates in three dimensions is presented, applicable to real silica aerogels as well. This correlation function analysis should clarify the reason these changes of criticality occur in the 3DXY model in DLCA, and why the crossover to bulklike behavior of superfluid 4He, confined in aerogels, is not observed.

Año de publicación:

2003

Keywords:

Fuente:

scopus