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Dependence of the magnetocaloric effect on the A-site ionic radius in isoelectronic manganites
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Image of FIG. 1.
FIG. 1.

Temperature dependence of field-cooled (filled symbols) and zero-field-cooled (open symbols) magnetization for all compounds, measured at 200 Oe.

Image of FIG. 2.
FIG. 2.

Magnetic isotherms at various temperatures around TC for (a) , (b) , (c) , and (d) samples. The main difference is that exhibits a metamagnetic transition, suggesting that the compound presents first-order magnetic transition. The Arrott plots for all studied compounds are shown in the Figures 2(e)–2(h) .

Image of FIG. 3.
FIG. 3.

Magnetic-entropy change as a function of temperature for and for , 20, 30, 40, and 50 kOe. Inset: Dependence of the maximum-magnetic entropy change ( ) on the applied magnetic-field change for and . The displacement of peak with increasing changes from 292 K up to 296 K for and from 120 K up to 126 K for .

Image of FIG. 4.
FIG. 4.

Dependence of magnetic entropy change and the Curie temperature on the average ionic radius of the A-site and tolerance factor. With decreasing , the structure becomes more distorted, which gives rise to a structural transition from rhombohedral (high symmetry) to orthorhombic (low symmetry).


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Table I.

Crystal lattice parameters and mean crystallite size values for all samples based on Rietveld refinement.

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Table II.

Maximum magnetic entropy change ( ) for peak half width ( ) and RCP.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dependence of the magnetocaloric effect on the A-site ionic radius in isoelectronic manganites