Double-exchange ferromagnetism in L

J. Park, S. W. Cheong, C. Chen

Research output: Contribution to journalArticlepeer-review

116 Scopus citations


We have investigated the appearance of ferromagnetism in a mixture of nonferromagnets (Formula presented) and (Formula presented), without heterovalent ion substitution in La sites. (Formula presented)(Formula presented)(Formula presented) and (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented) are studied by using x-ray-absorption and resonant photoemission spectroscopies. The results show that the dopant Co in (Formula presented)(Formula presented)(Formula presented) becomes divalent rather than expected trivalent and induces (Formula presented)-(Formula presented) mixed valence states. Therefore, at variance with the earlier proposal of a structure-induced (Formula presented)-(Formula presented) ferromagnetic coupling, the ferromagnetic state in (Formula presented)(Formula presented)(Formula presented) is consistent with the (Formula presented)-(Formula presented) double-exchange mechanism.

Original languageEnglish (US)
Pages (from-to)11072-11075
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
StatePublished - 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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