Influence of structural-phase transition on the magnetocaloric effects of lanthanum manganites

We studied the magnetic entropy change (Δ S m) of the perovskite manganites La 0.7Ca 0.3− x Sr x MnO 3 ( x = 0.12 , 0.135, and 0.15). Effect of orthorhombic–rhombohedral structural transition, coinciding with the ferromagnetic–paramagnetic (FM–PM) phase transition, on the Δ S m is observed. The stru...

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Veröffentlicht in:	Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.2818-2819
Hauptverfasser:	Kim, J.S., Ulyanov, A.N., Kang, Y.M., Min, S.G., Yu, S.C., Yoo, S.I.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Lanthanum mangnite Magnetic properties and materials Magnetically ordered materials: other intrinsic properties Magnetocaloric effect Magnetocaloric effect, magnetic cooling Magnetotransport phenomena, materials for magnetotransport Manganites Phase transition Physics
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Zusammenfassung:	We studied the magnetic entropy change (Δ S m) of the perovskite manganites La 0.7Ca 0.3− x Sr x MnO 3 ( x = 0.12 , 0.135, and 0.15). Effect of orthorhombic–rhombohedral structural transition, coinciding with the ferromagnetic–paramagnetic (FM–PM) phase transition, on the Δ S m is observed. The structural transition causes the double-step decrease of magnetization with temperature and widens the magnetic transition, leading to splitting of Δ S m into two peaks and also decrease in the overall values of Δ S m.
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2006.10.964