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Dependence of the magnetocaloric effect on the A-site ionic radius in isoelectronic manganites
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10.1063/1.4795769
/content/aip/journal/jap/113/11/10.1063/1.4795769
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/11/10.1063/1.4795769

Figures

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).

Tables

Generic image for table
Table I.

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

Generic image for table
Table II.

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

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/content/aip/journal/jap/113/11/10.1063/1.4795769
2013-03-19
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dependence of the magnetocaloric effect on the A-site ionic radius in isoelectronic manganites
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/11/10.1063/1.4795769
10.1063/1.4795769
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