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Direct and specific heat study of magnetocaloric effect in La0.845Sr0.155MnO3

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4 Author(s)
Szewczyk, A. ; Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, Warsaw, Poland ; Gutowska, M. ; Piotrowski, K. ; Dabrowski, B.

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Magnetocaloric effect and specific heat of a La0.845Sr0.155MnO3 sample were measured over a temperature range of 4.2–300 K, to verify whether large entropy changes induced by magnetic field make possible the use of manganites for magnetic refrigeration and whether a magnetostrictive contribution to magnetocaloric effect is significant. Isothermal entropy change and adiabatic temperature change induced by ΔB=7 T were determined as functions of temperature. Near to the Curie temperature, TC≈234 K, they reach, respectively, ∼-6.6 J/(kg K) and ∼3.4 K, i.e., the values ∼2 and ∼4 times smaller than for Gd. Despite the presence of large magnetostriction, its contribution to magnetocaloric effect was found negligible. © 2003 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:94 ,  Issue: 3 )