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The magnetic and magnetotransport properties of the oxygen deficientperovskites, SrCo1-xMxO3-d with M = Nb and Ru, were investigated. Both Nb- andRu-substituted cobaltites are weak ferromagnets, with transition temperaturesTm of 130-150 K and 130-180 K, respectively, and both exhibit a spin glassbehavior at temperatures below Tf = 80-90 K. It is demonstrated that thereexists a strong competition between ferromagnetism and spin glass state, whereCo4+ induces ferromagnetism, whereas Nb or Ru substitution at the cobalt sitesinduces magnetic disorder, and this particular magnetic behavior is the originof large negative magnetoresistance of these oxides, reaching up to 30% at 5 Kin 7 T. The differences between Nb- and Ru-substituted cobaltites are discussedon the basis of the different electronic configuration of niobium and rutheniumcations.Comment: 32 pages, 9 figures, to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

Competition between ferromagnetism and spin glass: The key for large magnetoresistance in oxygen-deficient perovskites<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>M</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:…

Competition between ferromagnetism and spin glass: The key for large magnetoresistance in oxygen-deficient perovskitesSrCo1−xMxO