期刊
PHYSICA SCRIPTA
卷 96, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1402-4896/abdf84
关键词
nonmagnetic substitution; cation disorder; magnetic frustration; Griffiths phase; ferromagnetic superexchange
The structural, electronic, and magnetic properties of La2Ni1-xScxMnO6 compounds were extensively studied, revealing that Sc3+ substitution led to the evolution of competing magnetic phases and caused changes in lattice parameters.
The structural, electronic, and magnetic properties of a sol-gel prepared series of La2Ni1-xScxMnO6 compounds have been extensively studied using x-ray diffraction, x-ray absorption near edge structure, and dc magnetization techniques, respectively. The entire series was isostructural and exhibited the La2NiMnO6 double perovskite P2(1)/n monoclinic structure. The nonmagnetic Sc3+ substitution led to the evolution of competing magnetic phases in La2Ni1-xScxMnO6. The substitution also caused an increase in lattice parameters, cell volume, and bond lengths. Consequently, Sc3+ dilution resulted in a dramatic decrease in Curie temperature, suggesting a reduction in the strength of the Ni2+-O2--Mn4+ superexchange ferromagnetic interaction. The Sc3+ substitution generated antisite defects, which significantly suppressed the saturation magnetization of the system. The competing magnetic interactions observed in the La2Ni1-xScxMnO6 system are discussed in terms of cation disorder, cation valances, and changes in the bond lengths/angles, caused by the Sc3+ substitution.
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