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arXiv 1107.4206cond-mat.mtrl-sci
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Mn2InSbO6和Mn2ScSbO6的短程自旋序和阻挫磁性

Short-range spin order and frustrated magnetism in Mn2InSbO6 and Mn2ScSbO6

S. A. Ivanov, P. Nordblad, R. Mathieu, R. Tellgren, E. Politova, G. André

摘要:

采用固相反应法制备了具有刚玉结构的复合金属氧化物Mn_2AsbO_6(A=In,Sc)的多晶粉末。采用X射线和中子粉末衍射、电子显微镜、量热和磁性测量相结合的方法研究了晶体结构和磁性。在室温下,这些化合物采用三角结构,空间群R-3,a = 8.9313(1)<$,c = 10.7071(2)<$(对于In)和a = 8.8836(1)<$,c = 10.6168(2)<$(对于Sc),该结构在低至1.6K下保持不变。Mn和A阳离子被发现是随机分布在A-网站。Mn 2 InSbO 6和Mn 2ScSbO 6的磁化强度的总体行为非常相似。尽管相对大量的Mn离子的A-网站上,只有短程磁性观察。Mn 2 InSbO 6的中子衍射图显示没有证据表明在1.6 K的长程磁有序,而不是只有一个弱的扩散磁峰在低温下观察到。所观察到的结构和磁性的Mn 2ASbO 6的因素进行了讨论,并与其他含锰的复合金属氧化物与刚玉相关的结构进行了比较。还考虑了A-阳离子亚晶格对磁性的影响。

英文摘要:

The complex metal oxides Mn2ASbO6 (A=In, Sc) with a corundum-related structure A3BO6 have been prepared as polycrystalline powders by a solid state reaction route. The crystal structure and magnetic properties have been investigated using a combination of X-ray and neutron powder diffraction, electron microscopy, calorimetric and magnetic measurements. At room temperature these compounds adopt a trigonal structure, space group R-3 with a = 8.9313(1) Å, c = 10.7071(2) Å (for In) and a = 8.8836(1) Å, c = 10.6168(2) Å (for Sc) which persists down to 1.6 K. The Mn and A cations were found to be randomly distributed over the A-sites. The overall behavior of the magnetization of Mn2InSbO6 and Mn2ScSbO6 is quite similar. In spite of the relatively large amount of Mn ions on the A-site, only short-ranged magnetism is observed. Neutron diffraction patterns of Mn2InSbO6 showed no evidence of a long-range magnetic ordering at 1.6 K, instead only a weak diffuse magnetic peak was observed at low temperatures. The factors governing the observed structural and magnetic properties of Mn2ASbO6 are discussed and compared with those of other Mn-containing complex metal oxides with a corundum-related structure. The influence of the A-cation sublattice on magnetic properties is also considered.

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