Large magnetoresistance in three dimensionally ordered macroporous perovskite manganites prepared by a colloidal templating method

Macroporous perovskite manganites La0.7Ca0.3-xSrxMnO3, with highly ordered pores, were prepared by a colloidal templating technique. The pore size was found to be about 400 nm and the wall thickness was in the range of 40-60 nm. As the Sr content increased, the ferromagnetic transition temperature (...

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Bibliographic Details
Published in:Journal of materials chemistry 2004-01, Vol.14 (11), p.1774-1777
Main Authors: Kim, Young Nam, Kim, Seung Joo, Lee, Eun Kwang, Chi, Eun Ok, Hur, Nam Hwi, Hong, Chang Seop
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Manganites
Materials science
Physics
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Summary:Macroporous perovskite manganites La0.7Ca0.3-xSrxMnO3, with highly ordered pores, were prepared by a colloidal templating technique. The pore size was found to be about 400 nm and the wall thickness was in the range of 40-60 nm. As the Sr content increased, the ferromagnetic transition temperature (TC) gradually rose to 350 K. The x = 0.1 sample exhibited a metal-insulator transition near TC. A large negative magnetoresistance (MR), which was independent of temperature, was also seen below TC. The large MR might be ascribed to spin polarised tunnelling at the nano-sized grain boundaries. 18 refs.
ISSN:0959-9428
1364-5501
DOI:10.1039/b402899f