Scaling properties of the critical behavior in the dilute antiferromagnet Fe(0.93)Zn(0.07)F2

Details Scaling properties of the critical behavior in the dilute antiferromagnet Fe(0.93)Zn(0.07)F2 Scaling properties of the critical behavior in the dilute antiferromagnet Fe(0.93)Zn(0.07)F2

2000-12-19

arxiv.org/abs/cond-mat/0012343v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

17 pages, 5 figures

Scientific paper

10.1088/0953-8984/13/8/308

Critical scattering analyses for dilute antiferromagnets are made difficult by the lack of predicted theoretical line shapes beyond mean-field models. Nevertheless, with the use of some general scaling assumptions we have developed a procedure by which we can analyze the equilibrium critical scattering in these systems for H=0, the random-exchange Ising model, and, more importantly, for H>0, the random-field Ising model. Our new fitting approach, as opposed to the more conventional techniques, allows us to obtain the universal critical behavior exponents and amplitude ratios as well as the critical line shapes. We discuss the technique as applied to Fe(0.93)Zn(0.07)F2. The general technique, however, should be applicable to other problems where the scattering line shapes are not well understood but scaling is expected to hold.

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