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

Research output: Contribution to journalArticle

24 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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Manganites
Magnetoresistance
Perovskite
porosity
Metal insulator transition
Superconducting transition temperature
Pore size
Grain boundaries
grain boundaries
transition temperature
insulators
metals
Temperature
temperature
perovskite

ASJC Scopus subject areas

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

Cite this

Large magnetoresistance in three dimensionally ordered macroporous perovskite manganites prepared by a colloidal templating method. / Kim, Young Nam; Kim, Seung Joo; Lee, Eun Kwang; Chi, Eun Ok; Hur, Nam Hwi; Hong, Chang Seop.

In: Journal of Materials Chemistry, Vol. 14, No. 11, 07.06.2004, p. 1774-1777.

Research output: Contribution to journalArticle

Kim, Young Nam ; Kim, Seung Joo ; Lee, Eun Kwang ; Chi, Eun Ok ; Hur, Nam Hwi ; Hong, Chang Seop. / Large magnetoresistance in three dimensionally ordered macroporous perovskite manganites prepared by a colloidal templating method. In: Journal of Materials Chemistry. 2004 ; Vol. 14, No. 11. pp. 1774-1777.
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