Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides

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Abstract

The magnetic and magnetotransport properties of the manganites, R1-xAxMnOz (R = La, Pr, Nd; A = Ca, Sr, Ba), are strongly dependent on the doping level x and the oxygen stoichiometry z. For x ≥ ∼ 0.2, stoichiometric R1-xAxMnO3 was found to have a small temperature independent coercivity of 5-30 Oe and the saturation magnetization (∼ 90 emu/g) of fully aligned Mn ions. Oxygen deficient (or x < 0.2) R1-xAxMnOz has a saturation magnetization smaller than that of fully aligned Mn spins and shows an enhancement and temperature dependence of the coercivity, and spin freezing behavior. The latter is characterized by a peak in zero field cooled (ZFC) magnetization. Our data suggest that oxygen deficient or low doped manganites are magnetically inhomogeneous. We discuss possible origins of the magnetic inhomogeneity and its influence on the colossal magnetoresistance.

Original languageEnglish
Pages (from-to)200-208
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume167
Issue number3
DOIs
Publication statusPublished - 1997 Mar

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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