Large positive entropy change in several charge-ordering perovskites

The Nd0.5Sr0.5Mn1−xCuxO3 (x=0.00; 0.02; 0.10) and Nd0.25Pr0.25Sr0.5MnO3 perovskites have been prepared by solid reaction technology. The manganites are of single phase with orthorhombic structure. The FC and ZFC measurements show an evident existence of charge-ordering effect at low temperatures. At...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 272-276; pp. 1292 - 1294
Main Authors Chau, N., Cuong, D.H., Tho, N.D., Nhat, H.N., Luong, N.H., Cong, B.T.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2004
Subjects
Charge ordering
Magnetic oxides
Magnetization
Magnetocaloric effect
Perovskite structure
Magnetic oxides
Magnetization
Magnetocaloric effect
Charge ordering
Perovskite structure
75.47.Lx Manganites
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Summary:The Nd0.5Sr0.5Mn1−xCuxO3 (x=0.00; 0.02; 0.10) and Nd0.25Pr0.25Sr0.5MnO3 perovskites have been prepared by solid reaction technology. The manganites are of single phase with orthorhombic structure. The FC and ZFC measurements show an evident existence of charge-ordering effect at low temperatures. At the charge-ordering temperature the magnetic entropy change, ΔS, is positive and the |ΔSmax| is larger than that determined at ferromagnetic-paramagnetic phase transition temperature.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.12.074