Exponents far from Tc-a reanalysis of the high-temperature susceptibility of some model systems

The authors reanalyse the Pade approximants for the susceptibility of different Ising and Heisenberg systems using the non-linear scaling variable t'=(T-T c )/T instead of t=(T-T c )/T c . The susceptibility data are well represented by the modified power law chi approximately (1/T)(t') - gamma up to high temperatures, whereas the conventional relation chi approximately t - gamma is valid only in a small temperature range. The trend of the deviations from the modified power law in terms of temperature, spin and lattice dimensionality looks quite sensible and physical. Altogether the domain where scaling ideas are useful appears to be much more extended than generally suspected.