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Spin-polarized tunneling in nanostructured La2/3Sr1/3MnO3

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Volume
320
Identifiers
DOI: 10.1016/s0921-4526(02)00654-3
Keywords
  • Low-Field Magnetoresistance
  • Spin-Polarized Tunneling
  • Nanostructured Materials

Abstract

Abstract We present magnetic and transport properties of nanocrystalline La 2/3Sr 1/3MnO 3 powders prepared by a gel-combustion method using citric acid as the fuel. The coercive magnetic field H c is significantly different to the field H c ∗ for which the magnetoresistance (MR) is maximum. The MR at low fields (LFMR) exhibits a power-law dependence with magnetization, MR∝ M n , with n=2.5–3.3 for temperatures ranging from 5 to 200 K . The results are discussed in terms of a distribution of particle size in our sample.

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