Metal-insulator transition induced by short range magnetic ordering in mono-layered manganite

E. O. Chi, W. S. Kim, C. S. Hong, N. H. Hur, Y. N. Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The structural, magnetic, and transport properties of a mono-layered manganite La0.7Sr1.3MnO4+δ were investigated using variable temperature neutron powder diffraction as well as magnetization and transport measurements. The compound adopts the tetragonal I4/mmm symmetry and exhibits no magnetic reflection in the temperature region of 10 K ≤ T ≤ 300 K. A weak ferromagnetic (FM) transition occurs about 130 K, which almost coincides with the onset of a metal-insulator (M-I) transition. Extra oxygen that occupies the interstitial site between the [(La,Sr)O] layers makes the spacing between the [MnO2] layers shorten, which enhances the inter-layer coupling and eventually leads to the M-I transition. We also found negative magneto resistance (MR) below the M-I transition temperature, which can be understood on the basis of the percolative transport via FM metallic domains in the antiferromagnetic (AFM) insulating matrix.

Original languageEnglish
Pages (from-to)573-578
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume24
Issue number5
DOIs
Publication statusPublished - 2003 May 20

Keywords

  • Magnetic ordering
  • Magnetism
  • Manganese oxide

ASJC Scopus subject areas

  • Chemistry(all)

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