%0 Journal Article
%T Instability of long-range order in a d = 3 random-field Ising model system: FexZn1-xF2
%A Montenegro F. C.
%A Lima K. A.
%A Torikachvili M. S.
%A Lacerda A. H.
%J Brazilian Journal of Physics
%D 2000
%I Scientific Electronic Library Online
%X Instabilities of long-range order are observed in samples of the d = 3 dilute uniaxial antiferromagnet Fe xZn1-xF2 with x = 0:56 and 0.41, under strong random fields. The onset of instability, mapped in the (H, T) phase diagrams of the samples, reveals that the H, T and x dependence of the effective random field is in qualitative agreement with a mean-field expression predicted in the weak-field limit for site diluted antiferromagnets.
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332000000400023