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The quicker freezing of hotter water, than a colder sample, when quenched toa common lower temperature, is referred to as the Mpemba effect (ME). Whilethis counter-intuitive fact remains a surprize since long, efforts have begunto identify similar effect in other systems. Here we investigate the ME in arather general context concerning magnetic phase transitions. From Monte Carlosimulations of model systems, viz., the $q$-state Potts model and the Isingmodel, with varying range of interaction and space dimension, we assert thathotter paramagnets undergo ferromagnetic ordering faster than the colder ones.The above conclusion we have arrived at following the analyses of thesimulation results on decay of energy and growth in ordering following quenchesfrom different starting temperatures, to fixed final temperatures below theCurie points. We have obtained a unique scaling picture, on the strength of theeffect, with respect to the variation in spatial correlation in the initialstates. These results are valid irrespective of the order of transition andrelevant to the understanding of ME in other systems, including water.

Mpemba Effect and Superuniversality across Orders of Magnetic Phase Transition