Nano Archive

The Role of Spin-Polarized Tunneling on Transport Properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 Nanocomposites (x = 0 ÷ 5wt%)

Phong, Pham Thanh and Khiem, Nguyen Van and Phuc, Nguyen Xuan and Hong, Le Van (2009) The Role of Spin-Polarized Tunneling on Transport Properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 Nanocomposites (x = 0 ÷ 5wt%). In: Springer Proceedings in Physics. Springer Berlin Heidelberg.

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Official URL: http://springer.metapress.com/content/hk3qw768m2j2...

Abstract

We have investigated the effect of artificial grain boundaries on the electromagnetic properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 nanocomposites (x x= 0 x÷ 5wt%). Based upon a spin-polarized tunneling mechanism we have proposed a phenomenological model to explain the observed electrical transport behavior over the whole temperature range (70 ÷ 300K), especially the gradual drop of metal-insulator transition temperature (Tp) as a function of increasing Al2O3 content, while the feromagnetic-paramagnetic transition temperature (TC) remains almost constant (TC x= 250K). A large low-field magneto-resistance was observed for all the composite samples and the largest magnetoresistance ratio was recorded for a composition with x x=0.01.

Item Type:Book Section
Subjects:Material Science > Functional and hybrid materials
ID Code:7209
Deposited By:CSMNT
Deposited On:30 Sep 2009 09:49
Last Modified:21 Jan 2010 16:46

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