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Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La 0.67– x RE x Ca 0.33 MnO 3 ( x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution by Pal, Anand; Nagaraja, B S; Rachana, K J; Supriya, K V; Kekuda, Dhananjaya; Rao, Ashok; Li, Chia-Ruei; Kuo, Yung-Kang is a Materials Science article available to read on EtoBox.

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Abstract We investigated the influence of 10% substitution of rare-earth (RE) elements on the crystallographic, transport, and magnetic properties of La0.67–x RE x Ca0.33MnO3(RE = Nd, Sm, and Gd, x = 0.0, 0.1) manganite perovskite compounds. The bulk polycrystalline samples were synthesized using solid-state reaction method. The phase purity and crystal structure of studied samples were confirmed by room temperature X-ray diffraction followed by the Rietveld refinement analysis. A high temperature insulator to low temperature metal phase transition is observed in electrical transport measurement. We observed an enhancement in the temperature coefficient of resistance (TCR) and magnetoresistance (MR) by partially substituting La with RE ions. The maximum TCR ≈ 22% and MR ≈ 96% are observed in Gd doped sample. The magnetic transition temperature, T c , decreases from ∼254 K for the pristine sample to about ∼165 K for the Gd-doped sample. Our analysis of electrical and thermal transport data shows that the Small Polaron Hopping (SPH) is predominant at high temperatures conduction mechanism, whereas at low temperatures mechanism is dominated by electron-magnon scattering. The high temp

Who reads Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La 0.67– x RE x Ca 0.33 MnO 3 ( x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution?

Author

Pal, Anand; Nagaraja, B S; Rachana, K J; Supriya, K V; Kekuda, Dhananjaya; Rao, Ashok; Li, Chia-Ruei; Kuo, Yung-Kang

Publisher

IOP Publishing; IOP Publishing Ltd. (ISSN 2053-1591)

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)