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A series of (La 1−x Gd x ) 1.4 Ca 1.6 Mn 2 O 7 (x=0–0.1) compounds were prepared by solid state reaction. With the increase of Gd content, Curie temperature decreases from 259K to 192K. These compounds show constant magnetic entropy changes (ΔS M ) of 3.0–3.1J/kgK in the field of 1T. In their composite materials, a plateau in ΔS M with...
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