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Co-existence of giant magnetoresistance and large magnetocaloric effect near room temperature in nanocrystalline La0.7Te0.3MnO3
Published in
2010
Volume: 322
   
Issue: 17
Pages: 2537 - 2540
Abstract
Sol-gel prepared nanocrystalline La0.7Te0.3MnO3 has rhombohedral crystal structure (space group R3-C) at room temperature and orders ferromagnetically at ∼280 K (TC). A large magnetic entropy change of ∼12.5 J kg-1 K-1 is obtained near TC for a field change of 50 kOe. This magnetocaloric effect could be explained in terms of Landau theory. The temperature dependence of electrical resistivity shows metal-insulator transition at TC and a giant magnetoresistance of ∼52% in 50 kOe. The co-existence of giant magnetoresistance and large magnetocaloric effect near room temperature makes nanocrystalline La0.7Te0.3MnO3 a promising material for magnetic refrigeration and spintronic device applications. © 2010 Elsevier B.V. All rights reserved.
About the journal
JournalJournal of Magnetism and Magnetic Materials
ISSN03048853
Open AccessNo
Concepts (29)
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    CO-EXISTENCE
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    Electrical resistivity
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    Field change
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    LANDAU THEORY
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    Magnetic entropy change
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    Magnetic refrigeration
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    Magneto-caloric effects
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    Magnetocaloric effect
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    Nanocrystallines
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    Near room temperature
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    PROMISING MATERIALS
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    RHOMBOHEDRAL CRYSTALS
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    Room temperature
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    Space groups
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    Spintronic device
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    Temperature dependence
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    Crystal structure
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    Electric conductivity
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    Electric resistance
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    Galvanomagnetic effects
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    Gels
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    Lanthanum
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    Magnetoelectronics
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    Manganese oxide
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    Metal insulator boundaries
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    Metal insulator transition
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    Semiconductor insulator boundaries
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    Tellurium compounds
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    Giant magnetoresistance