The effect of cation radii on structural, magnetic and electrical properties of doped manganites La$_{0.6-x}$Pr$_x$Sr$_{0.4}$MnO$_{3}$

S. Zemni; Ja. Dhahri; J. Dhahri; M. Oumezzine; H. Vincent

doi:doi:10.1051/jp4:2005123076

Issue		J. Phys. IV France Volume 123, March 2005


Page(s)		413 - 418
DOI		https://doi.org/10.1051/jp4:2005123076

J. Phys. IV France 123 (2005) 413-418
DOI: 10.1051/jp4:2005123076

The effect of cation radii on structural, magnetic and electrical properties of doped manganites La_0.6-xPr_xSr_0.4MnO₃

S. Zemni¹, Ja. Dhahri¹, J. Dhahri¹, M. Oumezzine¹ and H. Vincent²

¹ Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences de Monastir, Département de Physique, 5019 Monastir, Tunisie
² Laboratoire des Matériaux et de Génie Physique, ENSPG, BP. 46, 38402 Saint-Martin d'Hères Cedex, France

Abstract
The effect of trivalent substitution into rare earth sites in La $_{0.6\hbox{-}{\rm x}}$ Pr $_{\rm x}$ Sr_0.4MnO₃ oxides has been studied. The structural, and magnetic properties of these compounds with a fixed Mn³⁺/Mn⁴⁺ ratio of 3/2 are studied. X-ray diffraction patterns show that these compounds are rhombohedral (R $\bar{\bf 3}$ c) below x = 0.42 and become orthorhombic (Pbnm) above x = 0.42. The paramagnetic to ferromagnetic transition temperature T $_{\rm C}$ decrease from 374K to 310K when < r $_{\rm A}$ > decreases. The ionic radii variance $\sigma^{2}$ decreases with the increase of < r $_{\rm A}$ >. The resistivity transition temperature T $_{\rho}$ decreases from 350 K to 280 K as Pr content increases.

The effect of cation radii on structural, magnetic and electrical properties of doped manganites La0.6-xPrxSr0.4MnO3

The effect of cation radii on structural, magnetic and electrical properties of doped manganites La_0.6-xPr_xSr_0.4MnO₃