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X-ray diffraction, magnetic and electrical properties in the manganites (La1−xNdx)0.7Sr0.3MnO3 by K. Cherif; J. Dhahri; H. Vincent; S. Zemni; E. Dhahri; M. Oumezzine is a Physics and Astronomy article available to read on EtoBox.

What is X-ray diffraction, magnetic and electrical properties in the manganites (La1−xNdx)0.7Sr0.3MnO3 about?

In several series of samples (La 1Àx Nd x ) 0.7 Sr 0.3 MnO 3 (0pxp1), we studied the evolution of structure, magnetic and electrical properties with x and the average ionic radius of the A site /r A S; which systematically varied while keeping the ratio Mn 3+ /Mn 4+ fixed. Based on the classical ceramic preparation method, the samples have perovskite-like structure with different degrees of distortion (rhombohedral and orthorhombic). With increasing Nd concentration, a systematic decrease in the ferromagnetic transition temperature ðT C Þ; the metal semi-conducting transition temperature ðT p Þ and the cell volume is observed. Meanwhile, the size of the resistivity r increases near T C : This phenomenon is interpreted as a gradual bending of the Mn-O-Mn bond angle, with decreasing /r A S; which causes the narrowing of the electronic bandwidth and the effect of the A-site variance s 2 :

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Author

K. Cherif; J. Dhahri; H. Vincent; S. Zemni; E. Dhahri; M. Oumezzine

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4526)

Published

2002

Language

EN

Field

Physics and Astronomy (Physical Sciences)