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2010 | 117 | 2 | 281-285
Article title

Local Structure of Mn in (La_{1-x}Ho_{x})_{2/3}Ca_{1/3}MnO_{3} Studied by X-ray Absorption Fine Structure

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EN
Abstracts
EN
Results of X-ray absorption fine structure measurements in manganites (La_{1-x}Ho_{x})_{2/3}Ca_{1/3}MnO_{3} with 0.15 < x < 0.50 are presented. When LaMnO_{3} is doped with a divalent element such as Ca^{2+}, substituting for La^{3+}, holes are induced in the filled Mn d orbitals. This leads to a strong ferromagnetic coupling between Mn sites. Ca ions in La_{1-x}Ca_{x}MnO_{3} introduce a distortion of the crystal lattice and mixed valence Mn ions (Mn^{3+} and Mn^{4+}). On the other hand, in manganites (La_{1-x}Ho_{x})_{2/3}Ca_{1/3}MnO_{3} the substitution of La for Ho causes a lattice distortion and induces a disorder, which reduces a magnetic interaction. The ferromagnetic transition temperature and conductivity decrease very quickly with increasing x. The magnetic and transport properties of compounds depend on the local atomic structure around Mn ions. The information on the bond lengths and Debye-Waller factor are obtained from the extended X-ray absorption fine structure (EXAFS) data analysis. The charge state of Mn is determined from the position of the absorption edge in X-ray absorption near edge structure (XANES) data. XAFS results are in good agreement with magnetic characteristics of the studied materials.
Keywords
EN
Contributors
author
  • Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
author
  • Department of Chemistry, University of Warsaw, al. Żwirki i Wigury 101, 02-089 Warsaw, Poland
author
  • Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
author
  • Center for Study Matter at Extreme Conditions, Florida International University, Miami, USA
author
  • Montefiore Electricity Institute, University of Liege, 4000 Liege, Belgium
  • Montefiore Electricity Institute, University of Liege, 4000 Liege, Belgium
author
  • Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
author
  • Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv117n206kz
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