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

• Authors: A. Pietnoczka , M. Pękała , R. Bacewicz , V. Drozd , J. Fagnard , P. Vanderbemden , J. Antonowicz , W. Zalewski
• Languages of publication: 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

61.05.cj; 75.47.Lx; 87.64.kd

Discipline

• 61.05.cj: X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.(for x-ray and EXAFS applications in biological physics, see 87.64.kd)
• 87.64.kd: X-ray and EXAFS
• 75.47.Lx: Magnetic oxides

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 117
• Issue: 2
• Pages: 281-285

Dates

published

2010-02

Contributors

author

A. Pietnoczka

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

M. Pękała

• Department of Chemistry, University of Warsaw, al. Żwirki i Wigury 101, 02-089 Warsaw, Poland

author

R. Bacewicz

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

V. Drozd

• Center for Study Matter at Extreme Conditions, Florida International University, Miami, USA

author

J. Fagnard

• Montefiore Electricity Institute, University of Liege, 4000 Liege, Belgium

author

P. Vanderbemden

• Montefiore Electricity Institute, University of Liege, 4000 Liege, Belgium

author

J. Antonowicz

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

W. Zalewski

• Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.117.281