Magnetic and transport properties of Bi0.5Ca0.5FexMn1−xO3 (0≤x≤0.6)
Magnetic and transport properties of Bi0.5Ca0.5FexMn1−xO3 (0≤x≤0.6)
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DOI：
10.1088/0953-8984/17/27/008
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
D. Tzankov;D. Kovacheva;K. Krezhov;R. Puźniak;A. Wisniewski;E. Svab;M. Mikhov
中科院分区：
文献类型：
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作者：
D. Tzankov;D. Kovacheva;K. Krezhov;R. Puźniak;A. Wisniewski;E. Svab;M. Mikhov
采用陶瓷技术合成了一系列Fe取代的锰氧化物Bi0.5Ca0.5FexMn1− xO 3（0≤x≤0.6）。从X射线粉末衍射和中子衍射研究发现，在室温下的晶格参数单调变化与增加Fe取代Mn。在5和1300 K之间的磁场高达16 kOe的磁性进行了研究。所有化合物在一定温度以下都是反铁磁性的，且随着Fe取代量的增加反铁磁性降低，当x≥0.1时，反铁磁性伴随着弱铁磁性。对于没有或具有非常低的Fe取代（x = 0和0.05）的化合物，电荷/轨道顺序以纯形式存在。在Fe取代x≥0.3的锰氧化物的顺磁区存在一个新的磁团簇态，但只有在磁场存在的情况下。在100和600 K之间测量的化合物的导电性是半导体类型，并且在高达7 kOe的磁场中没有磁阻效应。
A series of Fe-substituted manganites Bi0.5Ca0.5FexMn1−xO3 (0≤x≤0.6) was synthesized by ceramic technology. The crystal lattice parameters change monotonically with increasing Fe substitution for Mn as found from x-ray powder diffraction and neutron diffraction investigations at room temperature. Magnetic properties were studied between 5 and 1300 K in fields up to 16 kOe. All the compounds are antiferromagnetic below a certain temperature, which decreases with increasing Fe substitution, and for x≥0.1 the antiferromagnetism is accompanied by a weak ferromagnetism. The charge/orbital order exists in the pure form for the compounds without or with very low Fe substitution (x = 0 and 0.05). A new magnetic cluster state exists in the paramagnetic region of manganites with Fe substitution x≥0.3, but only in the presence of magnetic field. The conductivity of compounds measured between 100 and 600 K is of semiconducting type, and there is no magnetoresistivity effect in fields up to 7 kOe.