Various disordered ground states and 1/3 magnetization-plateau-like behaviors in the S = 1/2 Ti3+ kagome antiferromagnets Rb2NaTi3F12, Cs2NaTi3F12, and Cs2KTi3F12
Various disordered ground states and 1/3 magnetization-plateau-like behaviors in the S = 1/2 Ti3+ kagome antiferromagnets Rb2NaTi3F12, Cs2NaTi3F12, and Cs2KTi3F12
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S = 1/2 Ti3 kagome 反铁磁体 Rb2NaTi3F12、Cs2NaTi3F12 和 Cs2KTi3F12 中的各种无序基态和 1/3 磁化平台状行为
DOI：
10.1103/physrevb.94.104432
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发表时间：
2016
影响因子：
3.7
通讯作者：
Kazuyoshi Yoshimura
中科院分区：
文献类型：
--
作者：
Masato Goto;Hiroki Ueda;Chishiro Michioka;Akira Matsuo;Koichi Kindo;Kazuyoshi Yoshimura
我们用单晶研究了三种kagome晶格反铁磁体的晶体结构和磁性能。这些化合物代表一个由磁性组成的agome体系，预计具有可忽略不计的小Dzyaloshinsky-Moriya相互作用。结构分析表明，这三种化合物中的每一种都具有轻微扭曲的kagome晶格。随着组成碱金属离子半径的增大，kagome晶格的畸变变小。这三种化合物具有几乎相同的魏斯温度k，基态是无序的，并且强烈依赖于畸变。的基态和基态分别为双组分态，包括大约1/3的近自由自旋，无间隙无序态和有间隙无序态。我们的实验结果表明，理想的海森堡kagome晶格反铁磁体的基态是间隙的。此外，和的磁化曲线在约1/3的满磁矩处显示异常，这是对理论提出的1/3磁化平台在agome反铁磁体中的显著观察。
We have investigated the crystal structure and magnetic properties of three kagome lattice antiferromagnets,, and, using single crystals. These compounds represent akagome system consisting of magneticions, which is expected to have negligibly small Dzyaloshinsky-Moriya interaction. The structural analyses revealed that each of the three compounds has a slightly distorted kagome lattice. The distortion of the kagome lattice becomes small as the ionic radii of constituent alkali metals increase. All three compounds have nearly the same Weiss temperature ofK, and the ground states are disordered and strongly depend on the distortion. The ground states of, andare found to be a two-component state including approximately 1/3 nearly free spins, a gapless disordered state, and a gapped disordered state, respectively. Our experimental results suggest that the ground state of the idealHeisenberg kagome lattice antiferromagnet is gapped. In addition, the magnetization curves ofandshow anomalies at approximately 1/3 of the full magnetic moment of, which are a notable observation of signs of the theoretically proposed 1/3 magnetization plateau inkagome antiferromagnets.