Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

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Abstract

A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, $R{\text{Co}}_{2}$, and mixed manganites, ${\text{La}}_{2/3}{({\text{Ca}}_{x}{\text{Sr}}_{(1\ensuremath{-}x)})}_{1/3}{\text{MnO}}_{3}$, which exhibit first- and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first-order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.

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