期刊
JOURNAL OF APPLIED PHYSICS
卷 116, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4890321
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资金
- National Basic Research Program of China (973 Program) [2014CB932103]
- National Science Foundation of Jiangsu Province of China [BK20141337]
- Fundamental Research Funds for the Central Universities
- SRTP Grant of the Southeast University, China
Double perovskite La2-xCaxCoMnO6 (x = 0, 0.1, 0.2, 0.5) ceramics samples were synthesized by the standard solid-state reaction method. The crystal structures have been confirmed to be monoclinic perovskite structure with space group of P2(1)/n at room temperature by the powder x-ray diffraction (Cu-K alpha). The grains of the samples are relatively dense and distribute in random directions from the scanning electron microscope patterns. Holes are doped into La2CoMnO6 with the substitution of the Ca2+ ions in La-site, and further lead to the valences of Mn ions and Co ions transforming from Mn4+ and Co2+ to Mn3+ and Co3+, respectively. Ferromagnetic coupling of Mn4+-O2--Co2+ and antiferromagnetic coupling of Mn3+-O2--Co3+ are coexistent in La2-xCaxCoMnO6 system, which correspond to two transitions existed in field-cooling magnetization versus temperature curves. Curie temperature of La2-xCaxCoMnO6 system decreases with the increasing of Ca-substitution amount. The coexistence of different magnetic phases leads to the exchange bias effect. (C) 2014 AIP Publishing LLC.
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