Antiferromagnetic systems specific heat

Maybe the major achievement provided by the discovery of the fe rfim is the possibility to study the complete set of critical exponents on a ferroic system for the first time after their prediction [9,10]. Table 15.1 shows the results as compared with predictions from theory and simulations. Most remarkably, the order parameter exponent ft (Figure 15.10) clearly deviates from the prediction ft 0 and achieves a value which comes close to that observed recently on the standard rfim system, the dilute uniaxial antiferromagnet Fci ,Zn.,F2, x = 0.15, in an external magnetic field [50], Further, the most disputed value, namely the specific heat exponent a [48] (Figure 15.12) clearly describes the same logarithmic divergence as that found on Fci. Zn. I 2, a 0 [10], which still lacks theoretical confirmation. 

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