Magnetic and magnetoresistance properties in rhombohedral perovskite-type compounds

24 August 1998

journal article
Published by IOP Publishing in Journal of Physics: Condensed Matter

Vol. 10 (33) , 7485-7492
https://doi.org/10.1088/0953-8984/10/33/017

Abstract

The effects of monovalent alkali metal substitution into the lanthanide sites in oxides are presented. We report structural features, magnetic and electrical properties of these materials for . The lattice symmetry of the samples is found to be rhombohedral. All the phases are ferromagnetic, with Curie temperatures strongly dependent on x, reaching a maximum around 308 K for . A sharp drop of the resistivity is observed just below the Curie temperature. The ferromagnetic-metallic to paramagnetic-semiconducting transition is explained from the suggested distribution of the cations by the double exchange of pairs at the B-sublattice. Preliminary magnetoresistance measurements (MR) on bulk ceramic samples display an MR effect of the same amplitude as in the case of the alkaline earth substituted La manganites.

Keywords

This publication has 19 references indexed in Scilit:

Electrical conductivity of ferromagnetic compounds of manganese with perovskite structure
Published by Elsevier ,2004
Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides
Journal of Magnetism and Magnetic Materials, 1997
Giant magnetoresistance behaviour in in-situ La0.60Sr0.40MnO3 films grown on Si substrates by pulsed laser deposition
Applied Surface Science, 1997
Crystal structure and magnetoresistance of ${La}_{(2 - x) / 3}$ ${Nd}_{x / 3}$ ${Ca}_{1 / 3}$ ${MnO}_{3}$ :Local lattice distortion effect
Physical Review B, 1997
Giant Magnetoresistance in Transition Metal Oxides
Science, 1996
Structure dependence of the ferromagnetic transition temperature in rhombohedral ${La}_{1 - x}$ $A_{x}$ ${MnO}_{3}$ (A=Na, K, Rb, and Sr)
Physical Review B, 1995
Colossal magnetoresistance of 1 000 000-fold magnitude achieved in the antiferromagnetic phase of La1−xCaxMnO3
Applied Physics Letters, 1995
Room temperature giant magnetoresistance in La_1-xPb_xMnO₃
Journal of Physics D: Applied Physics, 1995
Lattice Effects on the Magnetoresistance in Doped LaMn $O_{3}$
Physical Review Letters, 1995
Perovskite-like La1−xKxMnO3 and related compounds: Solid state chemistry and the catalysis of the reduction of NO by CO and H2
Journal of Solid State Chemistry, 1975