一类五元化合物的磁性
Magnetic properties of a family of quinternary oxalates
摘要：
我们报告的四个同晶化合物的一个家庭的quinternary nitrates的磁性能下降到60 mK。在所有这些材料中，具有强磁晶各向异性的磁性Fe II离子形成扭曲的kagome晶格，如果仅考虑最近邻相互作用，则拓扑上等价于完美的kagome晶格。所有化合物在低温下均呈反铁磁排列，磁矩为120°。三种化合物（含可果美层间的Zr、Sn、Fe，但不含Al）在低于Néel温度时出现了显著的磁性行为：自旋各向异性与低交换路径网络连接性相结合，导致磁畴壁通过自由自旋串与可果美平面相交。这些产生了一个不熟悉的慢自旋动态观察到的AC磁化率的有序相，从交换释放的自旋翻转朝着合作行为的温度降低。
英文摘要：
We report on the magnetic properties of four isomorphous compounds of a family of quinternary oxalates down to 60 mK. In all these materials, the magnetic FeII ions with a strong magneto-crystalline anisotropy form a distorted kagome lattice, topologically equivalent to a perfect kagome one if nearest-neighbor interactions only are considered. All the compounds order at low temperature in an antiferromagnetic arrangement with magnetic moments at 120°. A remarkable magnetic behavior emerges below the Néel temperature in three compounds (with inter-kagome-layer Zr, Sn, Fe but not with Al): the spin anisotropy combined with a low exchange path network connectivity lead to domain walls intersecting the kagome planes through strings of free spins. These produce an unfamiliar slow spin dynamics in the ordered phase observed by AC susceptibility, evolving from exchange-released spin-flips towards a cooperative behavior on decreasing the temperature.
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