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Structure and magnetoresistance of La1-xCaxMn0.9Cu0.1O3 manganites

M.-L. CRAUS1,2, M. LOZOVAN2,*

Affiliation

  1. Joint Institute for Nuclear Research, Jolliot Curie 6, 141980 Dubna, Mosk.obl., Russia
  2. National Institute for Research and Development for Technical Physics, D. Mangeron 47, 700050 Iasi, Romania

Abstract

It is investigated the effect of Mn substitution with Cu on the structure, magnetic and transport properties of La1-xCaxMn0.9Cu0.1O3 manganites obtained by standard ceramic technology. The phase composition of the samples was monitorized by X-ray diffraction. The cell parameters, Mn-O distances, Mn-O-Mn angles, position of the atoms in the unit cell and the microstructure were determined and refined by means of CELLREF and FULLPROF programs. The increase of the La concentration leads to a decrease of the Mn4+ concentration, an increase of the unit cell volume and of the average radii of A and B places. Specific magnetization strongly depends on the thermal treatment and chemical composition. The Cu substitution produces very important change of the magnetic and transport properties, indicating very high values of magnetoresistance at temperatures higher than room temperature..

Keywords

La-Ca-Mn-Cu-O3, Magnetoresistance, Ferromagnetic clusters.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

M.-L. CRAUS, M. LOZOVAN, Structure and magnetoresistance of La1-xCaxMn0.9Cu0.1O3 manganites, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1008-1011 (2006)