Effects of magnetization on hole localization and MnO6 octahedra disorder in hole-doped lanthanum manganese perovskites

C. H. Booth*, F. Bridges, J. J. Neumeier, E. L. Brosha, T. H. Geballe, G. J. Snyder, G. H. Kwei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We review the distortions of the MnO6 octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems we consider include the "colossal" magnetoresistance (CMR) samples La1 - xCaxMnO3 (x=0.21, 0.25, 0.30), La0.67Ba0.33MnO3, and a poorer quality La0.67Pb0.33MnO3 sample. We also report preliminary work on three samples of oxygen-doped LaMnO3 + δ and a lanthanum-deficient La0.9MnO3 sample. We find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca-doped samples. The MnO6 distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above Tc, the antiferromagnetic LaMnO3.006 sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near TN, possibly due to FM coupling within MnO planes.

Original languageEnglish (US)
Pages (from-to)295-298
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume12
Issue number1
StatePublished - 1999

Keywords

  • "colossal" magnetoresistance (CMR)
  • Jahn-teller polarons
  • LaAMno; laMno
  • X-ray-absorption fine-structure (XAFS)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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