Dramatic change in magnetization behaviors of la1.4Sr 1.6Mn2O7+δ by control of excess oxygen

Yuui Yokota, Jun Ichi Shimoyama, Shigeru Horii, Kohji Kishio

Research output: Contribution to journalArticle

Abstract

Effects of excess oxygen on the magnetic properties and crystal structure of La1.4Sr1.6Mn2Oy, single crystals have been systematically investigated. The magnetic easy axis of the crystal annealed at 700°C in flowing oxygen for long time was discovered to change from the c-axis to the ab-plane below ferromagnetic transition temperature (TC) by introduction of excess oxygen. Powder X-ray diffraction (XRD) analyses revealed that the c-axis length decreased and the a-axis length increased with increase of the excess oxygen. These behaviors are similar to that of increasing of strontium substitution level in the L 2-2xSr1-2xMn2O7 [(La,Sr)Mn327] system. TC was increased up to ∼130K by the introduction of excess oxygen, however the transition was broad. These suggested that the excess oxygen can play an important role for determining magnetic properties of the (La,Sr)Mn327.

Original languageEnglish
Pages (from-to)L204-L206
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume45
Issue number4-7
DOIs
Publication statusPublished - 2006 Feb 3
Externally publishedYes

Keywords

  • Excess oxygen
  • Jahn-Teller distortion
  • LaSrMnO
  • Magnetic easy axis
  • Mean valence of manganese
  • Oxygen content
  • Oxygen nonstoichiometry

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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