Structure, magnetism and transport of the perovskite manganites Ln 0.5Ca0.5MnO3 (Ln=Ho, Er, Tm, Yb and Lu)

Kenji Yoshii, Hideki Abe, Naoshi Ikeda

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

It was found that the manganese perovskite oxides Ln0.5Ca 0.5MnO3 (Ln=Ho, Er, Tm, Yb and Lu) have an orthorhombic structure (space group Pnma). The Mn-O-Mn angles were calculated to be ∼148-150°, revealing an existence of a large crystallographic distortion in these oxides. Electrical resistivity measurements indicated both an insulating nature and a small magnetoresistance effect, both of which are owing to narrow bandwidths of the Mn-3d electrons arising from the crystallographic distortion. DC magnetization measurements showed the three characteristic temperatures, which could be assigned to charge-order, antiferromagnetism of Mn moments, and possible glassy states. All of these temperatures were decreased for the heavier Ln ions, which is explained in connection with both a difference of ionic radii of Ln3+ and Ca2+, and a lowering of electron transfer. The charge-ordering transition was not clearly observed only for Lu0.5Ca0.5MnO3 containing the smallest lanthanide ion, plausibly due to a large randomness of magnetic interactions arising from the ionic radii difference of Lu3+ and Ca2+. In addition, preliminary measurements of AC dielectric response suggested that these manganites belong to a so-called multiferroic system.

Original languageEnglish
Pages (from-to)3615-3623
Number of pages9
JournalJournal of Solid State Chemistry
Volume178
Issue number12
DOIs
Publication statusPublished - Dec 1 2005
Externally publishedYes

Keywords

  • Antiferromagnetism
  • Charge order
  • Magnetoresistance
  • Manganite
  • Perovskite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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