Forschungsneutronenquelle Heinz Maier Leibnitz (FRM II), Technische Universität München, Lichetenbergstrasse 1, 85747 Garching, Germany.
Inorg Chem. 2011 Mar 21;50(6):2246-51. doi: 10.1021/ic101897a. Epub 2011 Feb 4.
We report the magnetic structure of two of the magnetically ordered phases of Co(3)(OH)(2)(C(4)O(4))(2)·3H(2)O, a coordination polymer that consists of a triangular framework decorated with anisotropic Co(II) ions. The combination of neutron diffraction experiments and magnetic susceptibility data allows us to identify one phase as displaying spin idle behavior, where only a fraction of the moments order at intermediate temperatures, while at the lowest temperatures the system orders fully. This novel magnetic behavior is discussed within the framework of a simple Hamiltonian and representational analysis and rationalizes this multiphase behavior by considering the combination of frustration and anisotropy.
我们报告了 Co(3)(OH)(2)(C(4)O(4))(2)·3H(2)O 配位聚合物的两种有序相的磁结构，该聚合物由三角形框架组成，框架上装饰有各向异性的 Co(II)离子。中子衍射实验和磁化率数据的结合使我们能够确定其中一个相表现出自旋惰性行为，其中只有一部分磁矩在中间温度下有序，而在最低温度下系统完全有序。这种新的磁行为在一个简单的哈密顿量和表示分析的框架内进行了讨论，并通过考虑挫折和各向异性的组合来合理化这种多相行为。
