Effect of cation size and disorder on the structural and transport properties of the manganites.

Irfan Mansuri 1Dinesh Varshney 1Yk Kuo 2

1. School of Physics, Devi Ahilya University (DAVV), Khandwa Road Campus, Indore 452017, India
2. National Dong Hua University, Hualien 97401, Taiwan

Abstract

We report the results of the magnetic, electrical and thermal transport properties of

mixed-valence with A site cation disordered La0.35Pr0.15Ca0.16Sr0.34MnO3 (ionic radii

<rA> of 1.237 A0) manganites. The x-ray diffraction pattern of poly

crystalline La0.35Pr0.15Ca0.16Sr0.34MnO3 manganites infers the orthorhombic

structure. Detailed resistivity measurement shows the semiconducting like behavoir

throughout temperature range. The dc magnetization measurement reveal that sample

undergoes a phase transition from paramanetic to ferromagnetic phase at Tc ~ 275 K

and to an antiferromagnetic phase at TN ~ 155 K upon further cooling.

The specific heat measurement depict a broadened jump in the vicinity of Tc,

indicating the magnetic ordering and magnetic inhomogeneity in the sample.

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium E, by Irfan Mansuri
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-09 09:01
Revised:   2009-06-07 00:48
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