title: Anomalous barocaloric effect in solid magnetic materials.
abstract: In this paper, we systematically discuss the barocaloric effect in solid magnetic materials undergoing both second and first order phase transition. For this purpose, we use a model of localized magnetic moments, including the magnetoelastic coupling and the Zeemann interaction. Our calculations show that the normal (inverse) barocaloric effect occurs whenever the applied pressure increases (decreases) the critical temperature and keeps the order of the phase transition. On the other hand, our calculations predict an anomalous barocaloric effect (i.e. a change of sign in the barocaloric potentials) in special cases where the applied pressure changes the phase transition from first to second order and vice versa.
authors: Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Rio de Janeiro, 20550-013, RJ, Brazil.
authors: R P
authors: RP
authors: Santana
authors: N A
authors: NA
authors: de Oliveira
authors: P J
authors: PJ
authors: von Ranke