Reference : Local Structure of Mn in (La1-xHox)2/3Ca1/3MnO3 Studied by X-ray Absorption Fine Structure
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/37710
Local Structure of Mn in (La1-xHox)2/3Ca1/3MnO3 Studied by X-ray Absorption Fine Structure
English
Pietnoczka, A. [Warsaw University of Technology > > > >]
Pekala, M. [University of Warsaw > > > >]
Bacewicz, R. [Warsaw University of Technology > > > >]
Drozd, V. [Florida International University, Miami > > > >]
Fagnard, Jean-François [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques > >]
Vanderbemden, Philippe mailto [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques > >]
Antonowicz, J. [Warsaw University of Technology > > > >]
Zalewski, W. [Warsaw University of Technology > > > >]
2010
Acta Physica Polonica A
117
2
Proceedings of the 8th National Meeting of Synchrotron Radiation Users (KSUPS-8)
257-261
Yes (verified by ORBi)
No
National
0587-4246
1898-794X
8th National Meeting of Synchrotron Radiation Users (KSUPS-8)
September 24-26, 2009
Podlesice
Poland
[en] manganites ; fine structure ; magnetic measurements
[en] Results of X-ray absorption fine structure measurements in manganites (La1-xHox)2/3Ca1/3MnO3 with 0.15 < x < 0.50 are presented. When LaMnO3 is doped with a divalent element such as Ca2+, substituting forLa3+, holes are induced in the filled Mn d orbitals. This leads to a strong ferromagnetic coupling between Mn sites. Ca ions in La1-xCaxMnO3 introduce a distortion of the crystal lattice and mixed valence Mn ions (Mn3+ and Mn4+). On the other hand, in manganites (La1-xHox)2/3Ca1/3MnO3 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.
Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Communauté française de Belgique - CfB
Researchers ; Professionals
http://hdl.handle.net/2268/37710
http://przyrbwn.icm.edu.pl/APP/ABSTR/117/a117-2-6.html

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