Magnetic Study of OrthomanganitesA1−xMnO3+y(A=La, Eu) with the Perovskite Structure
Magnetic Study of OrthomanganitesA1−xMnO3+y(A=La, Eu) with the Perovskite Structure
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钙钛矿结构正锰矿A1−xMnO3+y(A=La, Eu)的磁性研究
DOI：
10.1006/jssc.1996.7243
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发表时间：
1997
影响因子：
5.4
通讯作者：
A. Nabiałek
中科院分区：
文献类型：
--
作者：
I. Troyanchuk;H. Szymczak;N. Kasper;A. Nabiałek
摘要 研究了正锰矿A1−xMnO3+y(A=La, Eu;x≤0.2;y≤0.13)的晶体结构和磁性能。结果表明，氧含量的增加导致这些化合物从弱铁磁态转变为铁磁态。缺少阳离子的样品中 La1−xMnO3+y 的居里温度和 Eu1−xMnO3+y 磁簇的凝固温度均高于母体化合物（x=0）。建议在 x,y 值的中间范围内出现涉及铁磁域和反铁磁域的混合磁态。提出的论据支持这样的假设：轻掺杂绝缘区域中的磁性是由阴离子的超交换控制的，而不是由电荷载流子的交换控制的。
Abstract The crystal structure and magnetic properties of orthomanganitesA1−xMnO3+y(A=La, Eu;x≤0.2;y≤0.13) were investigated. It was shown that the increase of oxygen content leads to the transformation from the weak ferromagnetic to the ferromagnetic state in these compounds. The Curie temperatures of La1−xMnO3+yand freezing temperatures of magnetic clusters for Eu1−xMnO3+yin the samples with a deficit ofAcations are higher than those in parent compounds (withx=0). A mixed magnetic state involving ferro- and antiferromagnetic domains is suggested in the intermediate range ofx,yvalues. Arguments are presented to support the assumption that the magnetic properties in the lightly doped insulating regime are governed by superexchange via anions rather than by exchange via charge carriers.