Magnetic entropy change above 300 K, which is larger than that of gadolinium (Phys. Rev. B 57 (1998) 3478), has been observed in a Cu-doped manganites of La_0.7Sr_0.3Mn_1-xCu _xO₃ (x = 0.05,0.1). The large magnetic entropy change originated from a sharp magnetization jump is associated with a first-order crystallographic phase transition of the sample near the Curie temperature. These results suggest that the present Cu-doped manganites are suitable candidate materials for magnetic refrigerants in the room temperature magnetic-refrigeration technology. © 2004 Elsevier B.V. All rights reserved.

Phan M.-H., Peng H.-X., Yu S.-C., Tho N.D., Chau N.

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Từ khóa : Copper; Crystallography; Differential scanning calorimetry; Doping (additives); Entropy; Lanthanum compounds; Magnetization; Phase transitions; Thermogravimetric analysis; Cu-doped manganites; Magnetic entropy; Magnetic refrigeration; Spontaneous magnetization; Manganese compounds