Chemical pressure controlled colossal magnetoresistance effects in Lao0.6(Sr0.4-xCax)MnO3

R. S. Liu, C. H. Shen, Shu-Fen Hu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca2+ into the bigger Sr2+ sites in Lao0.6(Sr0.4-x) MnO3(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO6 octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

Original languageEnglish
Pages (from-to)1063-1072
Number of pages10
JournalInternational Journal of Inorganic Materials
Volume3
Issue number7
DOIs
Publication statusPublished - 2001 Dec 1

Keywords

  • A. oxides
  • B. chemical synthesis
  • D. crystal structure
  • D. magnetic properties

ASJC Scopus subject areas

  • Materials Chemistry

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