Physics – Condensed Matter – Materials Science
Scientific paper
2007-11-10
Physics
Condensed Matter
Materials Science
Journal of Alloys and Compounds (2007) (accept\'e, sous presse)
Scientific paper
The effect of cationic size mismatch at the A site at constant manganese valence on the structural and magnetic properties of a perovskite-type rare-earth manganate was investigated in the Pr0.9(Na1-xKx)0.1MnO3 solid solution system (0 <= x < 1). All members of this solid solution series are orthorhombic at room temperature, space group Pbnm. Structural refinements using the Rietveld method show that the cell volume increases and the static Jahn-Teller distortion decreases with increasing potassium content x. Magnetic properties are characterized by strong positive \theta p values, and are ascribed to a canted ferromagnetic arrangement. The high Curie constant values in the paramagnetic regime can be explained by a magnetic cluster model of 2-3 Mn ions.
Cheikh-Rouhou Abdelwaheb
Ranno Laurent
Strobel Pierre
Zouari Siwar
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