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Local structure of Mn in (La<inf>1-x</inf>Ho<inf>x</inf>) <inf>2/3</inf>Ca<inf>1/3</inf>MnO<inf>3</inf> studied by X-ray absorption fine structure

Pietnoczka, A and PȩkalŁa, M and Bacewicz, R and Drozd, V and Fagnard, JF and Vanderbemden, P and Antonowicz, J and Zalewski, W (2010) Local structure of Mn in (La<inf>1-x</inf>Ho<inf>x</inf>) <inf>2/3</inf>Ca<inf>1/3</inf>MnO<inf>3</inf> studied by X-ray absorption fine structure. Acta Physica Polonica A, 117. pp. 281-285. ISSN 0587-4246

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Results of X-ray absorption fine structure measurements in manganites (La Ho ) Ca MnO with 0.15 < x < 0.50 are presented. When LaMnO is doped with a, divalent element such as Ca , substituting for La , holes are induced in the filled Mn d orbitais. This leads to a, strong ferromagnetic coupling between Mn sites. Ca ions in La Ca MnO introduce a distortion of the crystal lattice and mixed valence Mn ions (Mn and Mn ). On the other hand, in manganites (La Ho ) Ca MnO 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. 1-x x 2/3 1/3 3 3 1-x x 3 1-x x 2/3 1/3 3 2+ 3+ 3+ 4+

Item Type: Article
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:18
Last Modified: 10 Apr 2021 22:50
DOI: doi:10.12693/APhysPolA.117.281