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Large positive magnetocaloric effect in a perovskite manganite

R. Mahendiran·B. G. Ueland·P. Schiffer·A. Maignan·C. Martin·M. Hervieu·B. Raveau·M. R. Ibarra·L. Morellon
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Abstract

We investigate the magnetothermodynamic properties of the perovskite manganite Pr0.46Sr0.54MnO3. Our data imply that the paramagnetic to antiferromagnetic transition at TN = 210 K is first order with an abrupt decrease of volume (~ 0.14 % in zero magnetic field) and is accompanied by a sharp anomaly in specific heat. Upon application of a sufficiently large magnetic field, the antiferromagnetic phase transforms into a ferromagnetic phase with a sharp increase in sample volume. This field induced transition results in a large positive magnetocaloric effect just below TN (∆Sm = 10.4 Jkg-1K-1 at H = 5.5 T), which is associated with the increasing stability of the antiferromagnetic state with decreasing temperature.

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R. Mahendiran, B. G. Ueland, P. Schiffer, A. Maignan, C. Martin, M. Hervieu, B. Raveau, M. R. Ibarra, L. Morellon. 2003-06-09. Large positive magnetocaloric effect in a perovskite manganite. https://arxiv.org/abs/cond-mat/0306223

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