Asymptotic and leading correction-to-scaling specific-heat critical exponents and amplitudes for quench-disordered ferromagnets from resistivity measurements

Abstract

We report an experimental determination of the asymptotic and leading correction-to-scaling specific-heat critical exponents and amplitudes for quench-disordered ferromagnets. The renormalization-group estimates, available for some of the amplitude ratios only, are in agreement with the presently determined values. The scaling relation α⁺=α^- is obeyed and the asymptotic amplitude ratio A⁺/A^- possesses a value characteristic of a three-dimensional isotropic nearest-neighbor Heisenberg ferromagnet with isotropic long-range dipolar interactions.