Zheng X G, Kubozono H, Nishiyama K, Higemoto W, Kawae T, Koda A, Xu C N
Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan.
Phys Rev Lett. 2005 Jul 29;95(5):057201. doi: 10.1103/PhysRevLett.95.057201. Epub 2005 Jul 25.
Muon spin rotation experiments are carried out on clinoatacamite, Cu2Cl(OH)3, which is a new geometrically frustrated system featuring a three-dimensional network of corner-sharing tetrahedral 3d Cu2+ spins. A long-range antiferromagnetic order occurs below 18.1 K with a surprisingly small entropy release of about 0.05Rln2/Cu. Below 6.5 K, the static long-range order transforms abruptly into a metastable state with nearly complete depolarization of muon spins which suggests strong fluctuation. The system then enters a state in which partial long-range order and spin fluctuation coexist down to the lowest experimentally attainable temperature of 20 mK. This work presents a novel system for studying geometric frustration.
在斜氯铜矿（Cu2Cl(OH)3）上进行了μ子自旋旋转实验，斜氯铜矿是一种新的几何阻挫体系，具有由共角四面体3d Cu2+自旋构成的三维网络。在18.1 K以下出现长程反铁磁序，其熵释放出奇地小，约为0.05Rln2/Cu。在6.5 K以下，静态长程序突然转变为一种亚稳态，μ子自旋几乎完全退极化，这表明存在强烈的涨落。然后，该系统进入一种状态，其中部分长程序和自旋涨落共存，直至实验可达到的最低温度20 mK。这项工作展示了一个研究几何阻挫的新型体系。
