Magnetorestistance and electrical transport properties of La0.67Ca0.33MnO3 (LCMO): xSiCN composites
D. Das, Atanu Saha, Stephen E. Russek, Rishi Raj, D. Bahadur
The magnetic and electrical transport properties of La0.67Cad0.33^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, Ms 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 Ms, Tc(/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.
, Saha, A.
, Russek, S.
, Raj, R.
and Bahadur, D.
Magnetorestistance and electrical transport properties of La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub> (LCMO): xSiCN composites, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31490
(Accessed December 2, 2023)