Low-Temperature Magnetoresistive Effect in Bulk La0.7Ca0.3-xSrxMnO3 Perovskites.
2001 (English)In: Materials Science Forum volumes 373-376: European Magnetic Materials and Applications (EMMA-2000): Proceedings of the 8th European Magnetic Materials and Applications Conference, Kyiv, Ukraine, June 7-10, 2000, Zürich: Trans Tech Publications , 2001, 585-588 p.Conference paper (Refereed)
The temperature and field dependencies of the magnetoresistivity (MR) were studied and analysed for two series of polycrystalline samples of La0.7Ca0.3-xSrxMnO3 (0 <x <0.3) obtained by the nitrate technology under different annealing conditions. X-ray patterns of the samples demonstrate a broad halo (3 degrees of 2 Theta approximate to7 degrees) related with diffusion scattering at the intergranular media. The temperature dependence of MR for these compounds showed, apart from the MR peak close to the ferromagnetic transition temperature T-c (caused by MR-mechanism inside grains), the significant increase of MR below T-c that is common for systems with weak bonds between grains. The low-temperature component of the MR depends on the average ionic radius of the cation at the A-site.
Place, publisher, year, edition, pages
Zürich: Trans Tech Publications , 2001. 585-588 p.
, Materials Science Forum, ISSN 0255-5476 ; 373
Manganites, colossal magnetoresistance, resistance, magnetoresistance, Curie point, polycrystalline thin film
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-22237DOI: 10.4028/0-87849-880-X.585ISBN: 978-0-87849-880-2OAI: oai:DiVA.org:umu-22237DiVA: diva2:213936
Editor: V.G. Bar'yakhtar2009-04-302009-04-302010-01-21