From a heuristic calculation of the leading order essential singularity in the distribution of Yang-Lee zeroes, we obtain new scaling relations near the ferromagnetic-Griffiths transition, including the prediction of a discontinuity on the analogue of the critical isotherm. We show that experimental data for the magnetization and heat capacity of $\mathrm{ La_{ 0.7}Ca_{ 0.3}MnO_3}$ are consistent with these predictions, thus supporting its identification as a Griffiths ferromagnet.
Categories: cond-mat.dis-nn