Two ferromagnetic phases in La1-xSrxMnO3 (x˜1/8)

H. Nojiri, K. Kaneko, M. Motokawa, K. Hirota, Y. Endoh, K. Takahashi

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

It was discovered in La1-xSrxMnO3 (x1/8) that a field-induced phase transition occurs from a ferromagnetic metal (FM) phase to a ferromagnetic insulator (FI) phase. The magnetization shows a sharp jump at the transition field accompanied by a remarkable increase of magnetoresistance. Striction measurements clarified that this transition is associated with the structural change from a Jahn-Teller (JT) distorted orthorhombic phase to a pseudocubic phase. These results evidently show that the FI phase with a pseudocubic symmetry is more stable in high fields than the FM phase due to the double-exchange interaction. The driving force of this transition is explained by the enhancement of the ferromagnetic superexchange interaction induced by an antiferromagnetic-type orbital ordering in the pseudocubic phase, which was recently found in the anomalous x-ray scattering experiments.

Original languageEnglish
Pages (from-to)4142-4148
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number6
DOIs
Publication statusPublished - 1999 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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