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IJPAP Vol.49(05) [May 2011] >

Title: Effect of structural disorder on electrical and magneto transport of La0.5Pr0.2R0.3MnO3 (R = Sr and Ba) manganite films
Authors: Markna, J H
Solanki, P S
Khachar, U D
Thaker, C M
Rana, D S
Kuberkar, D G
Keywords: Manganite films
Structural disorder
Magneto transport
Pulsed laser deposition
Issue Date: May-2011
Publisher: NISCAIR-CSIR, India
Abstract: The manganite thin films La0.5Pr0.2R0.3MnO3 (R = Sr2+ and Ba2+) have been studied to understand the effect of A-site cationic size disorder (σA2) on their electrical and magneto transport properties. Epitaxial thin films of La0.5Pr0.2Sr0.3MnO3 (LPSMO) and La0.5Pr0.2Ba0.3MnO3 (LPBMO) were synthesized using Pulsed Laser Deposition (PLD) technique with desirable thicknesses of 150 nm. In the present paper, it is shown, how Sr+2 and Ba+2 substitution at La-site leads to half-metallicity in LPSMO and low temperature resistivity minima in LPBMO films, respectively. It is observed that the resistivity and high field magneto resistance (HFMR) increase to ~ 55% in LPSMO and ~ 95% in LPBMO films with increasing size disorder. The increase in cation size disorder in LPBMO as compared to LPSMO, results in high values of positive and negative temperature coefficient of resistance (TCR) ~ 59.8%K−1 and −55.1% K−1, respectively.
Page(s): 354-359
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.49(05) [May 2011]

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