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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/15442

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15442

Title:	Influence of Nd Doping on the Magnetoresistance of La0.7−xNdxPb0.3MnO3
Authors:	Lin, C. H.;Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, Lance;Ou, C. R.
Contributors:	物理學系
Keywords:	Magnetoresistance;Spin-polarized tunneling;Variable range hopping
Date:	2010
Issue Date:	2013-02-05T02:20:39Z
Publisher:	Springer Science+Business Media
Abstract:	This paper presents an investigation on the magnetoresistance properties of the polycrystalline manganite oxides, La0.7−x Nd x Pb0.3MnO3 (x=0.0, 0.1, 0.5 and 0.7). We demonstrate that the magnetoresistance ratio is enhanced with the increase of Nd content due to the suppression of spin scattering in the presence of an applied magnetic field. We find that the magnetoresistance shows an increase with decreasing temperatures at low temperatures. These features have been conventionally attributed to spin-polarized tunneling at grain boundaries. The temperature dependence of the magnetoresistance can be described quite well by an expression of the type a+b/(T+c). At high temperatures the magnetoresistance ratio increases with increasing temperature and the resistivity shows the existence of the variable range hopping with Coulomb effects for x=0.5 and 0.7.
Relation:	Journal of Superconductivity and Novel Magnetism, 23(6): 949-951
Appears in Collections:	[Department of Physics] Periodical Articles

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