Magnetorestistance and electrical transport properties of La0.67Ca0.33MnO3 (LCMO): xSiCN composites

Published

June 1, 2004

Author(s)

D. Das, Atanu Saha, Stephen E. Russek, Rishi Raj, D. Bahadur

Abstract

The magnetic and electrical transport properties of La_0.67Cad0.33^MnO₃(LCMO): xSiCN (x=0-40 vol%) composites, synthesized by mechanical mixing of citrate gel derived LCMO and polymer derived ceramics SiCN, have been investigated as a function of composition. The ability of SiCN to behave as a sintering additive leads to interesting magnetic and electrical properties. Si⁺⁴, being strongly favored for tetrahedral coordination, cannot enter the perovskite lattice. Saturation moment, M_s of 68 emu/gm at 5 K and at 5 kOe field of pure LCMO shifts to 79 emu/gm in the sample with x=0.05 and then decreases monotonically as x increases further. The lower M_s, T_c(/I} and high electrical resistivity of the sample with x=0, compared to those which have been reported in the literature, is due to small particle size in nm range. SiCN as a sintering aid increases the particle size of LCMO to 1-2 υm for x=0.10. Three orders of magnitude change in electrical resistivity (204 Ω} cm for x=0;0.5 Ω} cm for x=0.5) is explained on the basis of the difference in the mobility of the charge carriers, by fitting the experimental transport data with a correlated polaron hopping model.

Citation

Journal of Applied Physics

Volume

95

Issue

11

Pub Type

Journals

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Citation

Das, D. , Saha, A. , Russek, S. , Raj, R. and Bahadur, D. (2004), Magnetorestistance and electrical transport properties of La_0.67Ca_0.33MnO₃ (LCMO): xSiCN composites, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31490 (Accessed November 21, 2024)