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Title: Magnetic properties of manganites doped with gallium, iron, and chromium ions

The magnetization and the crystal structure of the La{sub 0.7}Sr{sub 0.3}Mn{sub 1−x}M{sub x}O{sub 3} (M = Ga, Fe, Cr; x ≤ 0.3) systems are studied. The substitution of gallium and chromium is shown to cause phase separation into antiferromagnetic and ferromagnetic phases, whereas the substitution of iron for manganese stabilizes a spinglass state. The ferromagnetic phase in the chromium-substituted compositions is much more stable than that in the case of substitution by iron ions or diamagnetic gallium ions. The magnetic properties are explained in terms of the model of superexchange interactions and the localization of most e{sub g} electrons of manganese. The stabilization of ferromagnetism in the chromium-substituted compositions can be caused by the fact that the positive and negative contributions to the superexchange interaction between Mn{sup 3+} and Cr{sup 3+} ions are close to each other but the antiferromagnetic part of the exchange is predominant. Moreover, some chromium ions are in the tetravalent state, which maintains the optimum doping conditions.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. National Academy of Sciences of Belarus, Scientific and Practical Materials Research Center (Belarus)
  2. Belarussian State Agrarian Technical University (Belarus)
  3. Joint Institute for Nuclear Research (Russian Federation)
  4. Helmholtz Center (Germany)
Publication Date:
OSTI Identifier:
22472260
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 5; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CHROMIUM COMPOUNDS; CHROMIUM IONS; CRYSTAL STRUCTURE; DOPED MATERIALS; ELECTRONS; EXCHANGE INTERACTIONS; FERROMAGNETISM; GALLIUM COMPOUNDS; GALLIUM IONS; IRON COMPOUNDS; IRON IONS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANATES; MANGANESE IONS; STABILIZATION; STRONTIUM COMPOUNDS