Magnetocaloric effect of the (Pr,Ca)MnO3 manganite at low temperatures
authors Gomes, AM; Garcia, F; Guimaraes, AP; Reis, MS; Amaral, VS; Tavares, PB
nationality International
journal JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
author keywords manganites; magnetocaloric effect; metamagnetism
keywords MAGNETIC-ENTROPY CHANGE; ROOM-TEMPERATURE; REFRIGERATION
abstract We have studied the magnetocaloric effect of the Pr1-xCaxMnO3 manganite, with 0.30 <= x <= 0.45, from 2.5 upto 50K. At this temperature range, the (Pr,Ca)MnO3 System present ferro/antiferromagnetic phase mixture which is responsible for the colossal magnetoresistance. Magnetocaloric studies in manganites, up to now, have neglected this magnetic phase mixture, mainly due to the antiferromagnetic phase which is not so well explored in magnetic refrigeration studies as ferromagnetic systems is. In our study, we explain the origin of the negative and positive values of the magnetic entropy change, their temperature dependence as well as the high values. The study of systems with antiferromagnetic phase, as shown in this work, may open an important field in the search of new magnetic materials for magnetic refrigeration. (c) 2004 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-8853
year published 2005
volume 290
beginning page 694
ending page 696
digital object identifier (doi) 10.1016/j.jmmm.2004.11.339
web of science category Materials Science, Multidisciplinary; Physics, Condensed Matter
subject category Materials Science; Physics
unique article identifier WOS:000228837600175
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journal impact factor 2.717
5 year journal impact factor 2.723
category normalized journal impact factor percentile 54.977
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