Magnetic, thermal, and neutron diffraction studies of a coordination polymer: bis(glycolato)cobalt(ii)
Magnetic, thermal, and neutron diffraction studies of a coordination polymer: bis(glycolato)cobalt(ii)
复制标题
配位聚合物双(乙醇)钴(ii)的磁、热和中子衍射研究
DOI：
10.1039/c8dt04358b
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发表时间：
2019
影响因子：
4
通讯作者：
Fujita Wataru
中科院分区：
文献类型：
--
作者：
Nakane Tomohiro;Yoneyama Shota;Kodama Takeshi;Kikuchi Koichi;Nakao Akiko;Ohhara Takashi;Higashinaka Ryuji;Matsuda Tatsuma D.;Aoki Yuji;Fujita Wataru
二维二次晶格磁体，双（乙醇酸）钴（II）（[Co（HOCH 2CO 2）2]），在15.0 K时显示出反铁磁有序性，在H = 22 600 Oe和2 K时磁化强度突然增加，从而起到了超磁体的作用。 热容量的测量显示，在转变温度附近的熵变ΔS估计为6.20 J K−1 mol−1，Co（II）离子在低温下的总角动量为J = 1/2。中子衍射研究表明，Co（II）离子的磁矩矢量的振幅为3.59μB，并且与相邻离子的磁矩矢量不完全反平行，这导致了薄片中磁矩矢量之间的倾斜。倾斜角确定为7.1°。倾斜引起的净磁化在表中，但这种磁化被取消之间的表。在临界磁场下，片层中的磁化方向平行于磁场。
The two-dimensional quadratic lattice magnet, bis(glycolato)cobalt(II) ([Co(HOCH2CO2)2]), showed antiferromagnetic ordering at 15.0 K and an abrupt increase in magnetisation at H = 22 600 Oe and 2 K, thereby acting as a metamagnet. Heat capacity measurements revealed that the associated entropy change ΔS around the transition temperature was evaluated to be 6.20 J K−1 mol−1 and that the Co(II) ion had the total angular momentum of J = 1/2 at low temperatures. Neutron diffraction studies suggested that the magnetic moment vectors of the Co(II) ions had an amplitude of 3.59μB and were not aligned in a fully antiparallel fashion to those of their neighbours, which caused canting between the magnetic moment vectors in the sheet. The canting angle was determined to be 7.1°. Canting induced net magnetisation in the sheet, but this magnetisation was cancelled between sheets. The magnetisations in the sheets were oriented parallel to the magnetic field at the critical magnetic field.