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

Young Nam Kim, Seung Joo Kim, Eun Kwang Lee, Eun Ok Chi, Nam Hwi Hur, Chang Seop Hong

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25 Citations (Scopus)

Abstract

Macroporous perovskite manganites La0.7Ca0.3-xSr xMnO3, whose pores are highly ordered, have been 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 observed below TC. The large MR might be ascribed to spin polarized tunneling at the nano-sized grain boundaries.

Original languageEnglish
Pages (from-to)1774-1777
Number of pages4
JournalJournal of Materials Chemistry
Volume14
Issue number11
DOIs
Publication statusPublished - 2004 Jun 7

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

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