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 ${\mathrm{\ensuremath{\alpha}}}^{+}$=${\mathrm{\ensuremath{\alpha}}}^{\mathrm{\ensuremath{-}}}$ is obeyed and the asymptotic amplitude ratio ${\mathit{A}}^{+}$/${\mathit{A}}^{\mathrm{\ensuremath{-}}}$ possesses a value characteristic of a three-dimensional isotropic nearest-neighbor Heisenberg ferromagnet with isotropic long-range dipolar interactions.