Influence of frustration on a d = 3 diluted antiferromagnet: FexZn1−xF2

Abstract The influence of a frustrated bond on the magnetic properties of a d = 3 uniaxial (Ising) bcc diluted antiferromagnet, with emphasis in the compounds FexZn 1− x F 2 , is investigated by a local mean-field numerical simulation. In particular we find that the initial drop of the saturation staggered magnetization ( M S ) with concentration follows a percolation-like phenomenon characterized by an exponent β P . For the frustrated samples, however, this regime is followed by a second one identified by a ‘long tail’ effect such that M S is zero only at the percolation threshold. Our numerical data also confirms a spin-glass phase near this threshold.