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Effect of Fe-doping on Magnetocaloric Properties of AMn1?x Fe x O3 Compounds (0≤x≤0.2) |
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| Authors: | A Omri M Khlifi M Bejar E Dhahri M Sajieddine E K Hlil |
| Affiliation: | 1. Laboratoire de Physique Appliqu??e, Facult?? des Sciences de Sfax, Universit?? de Sfax, B.P. 1171, Sfax, 3000, Tunisia 2. Laboratoire de Physique et M??canique des Mat??riaux, Facult?? des Sciences et Techniques, Universit?? Sultan Moulay Sliman, B.P. 523, B??ni-Mellal, Morocco 3. Institut N??el, CNRS??Universit?? J. Fourier, BP 166, 38042, Grenoble, France |
| Abstract: | We have investigated the effect of iron substitution on the magnetocaloric properties of manganites with La0.75Ca0.08Sr0.17Mn1?x Fe x O3 (x=0, 0.075, 0.15, 0.175, and 0.2) nominal composition. The magnetocaloric effect (MCE) was estimated, in terms of isothermal magnetic entropy change (???S M ), using the M(T,?? 0 H) data and employing the thermodynamic Maxwell equation. The large magnetic entropy in AMn1?x Fe x O3 is attributed to the field-induced suppression of short-range charge-orbital ordering and antiferromagnetic fluctuations present above T C . The increase of the Fe concentration x is accompanied by a decrease of (???S M ), from 5.205 to 0.95?J/kg?K for x=0 and 0.20, respectively, with ?? 0 H=5?T. For all samples, we find quite large values of (???S M ), which are very close to that provided for Gd, the prototypical magnetocaloric material. |
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