Transport and magnetic properties of nanocrystalline La<inf>2/3</inf>Sr<inf>1/3</inf>MnO<inf>3</inf> powders synthesized by a nitrate-citrate gel-combustion process

Abstract:

We present magnetic and transport properties of nanocrystalline La2/3Sr1/3MnO3 powders prepared following a novel gel-combustion method using citric acid as the fuel. Magnetization (M) and magnetoresistance (MR) loops as a function of the applied magnetic field show that the coercive magnetic field Hc is significantly different to the field H*c for which the resistance is maximum. A power-law dependence of the MR with magnetization, MR ∝ Mn, with n≥2.5 has been observed at low fields between 5 and 200 K. The results are discussed in terms of spin-polarized tunneling models with a distribution of particle size in our sample. © 2002 Elsevier Science B.V. All rights reserved.

Año de publicación:

2002

Keywords:

• Spin-polarized tunneling
• Nanostructured materials
• Low-field magnetoresistance

Fuente:

scopus