IBS Center for Functional Interfaces of Correlated Electron Systems, Seoul National University, Seoul 151-742, Korea.
J Phys Condens Matter. 2012 Nov 14;24(45):456004. doi: 10.1088/0953-8984/24/45/456004. Epub 2012 Oct 23.
Li(2)MnO(3) consists of a layered Mn honeycomb lattice separated by a single layer of LiO(6) octahedra along the c-axis. By using single crystal Li(2)MnO(3) samples, we have examined the physical properties and carried out both powder and single crystal neutron diffraction studies to determine that Mn moments order antiferromagnetically at T(N) = 36 K with an ordered magnetic moment of 2.3 μ(B) perpendicular to the ab plane. We have also discovered that about 35% of the full magnetic entropy is released in the supposedly simple paramagnetic phase, indicative of unusual spin dynamics at higher temperature.
Li(2)MnO(3) 由沿 c 轴方向由单层 LiO(6) 八面体隔开的层状 Mn 蜂窝状晶格组成。通过使用单晶 Li(2)MnO(3) 样品，我们已经检查了物理性质，并进行了粉末和单晶中子衍射研究，以确定 Mn 磁矩在 T(N) = 36 K 处反铁磁有序，与 ab 平面垂直的有序磁矩为 2.3 μ(B)。我们还发现，在所谓的简单顺磁相中，大约 35%的全磁熵被释放，这表明在较高温度下存在异常的自旋动力学。
