Various disordered ground states and 1/3 magnetization-plateau-like behavior in the S=1/2 Ti3+ kagome lattice antiferromagnets Rb2NaTi3F12, Cs2NaTi3F12, and Cs2KTi3F12

被引：19

作者：

Goto, Masato ^{[1
]}

Ueda, Hiroaki ^{[1
]}

Michioka, Chishiro ^{[1
]}

Matsuo, Akira ^{[2
]}

Kindo, Koichi ^{[2
]}

Yoshimura, Kazuyoshi ^{[1
,3
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Kyoto Univ, Res Ctr Low Temp & Mat Sci, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 10期

基金：

日本学术振兴会;

关键词：

HEISENBERG-ANTIFERROMAGNET;

D O I：

10.1103/PhysRevB.94.104432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the crystal structure and magnetic properties of three kagome lattice antiferromagnets, Rb2NaTi3F12, Cs2NaTi3F12, and Cs2KTi3F12, using single crystals. These compounds represent a S = 1/2 kagome system consisting of magnetic Ti3+ ions, 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 of -45 K, and the ground states are disordered and strongly depend on the distortion. The ground states of Rb2NaTi3F12, Cs2NaTi3F12, and Cs2KTi3F12 are 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 ideal S = 1/2 Heisenberg kagome lattice antiferromagnet is gapped. In addition, the magnetization curves of Cs2NaTi3F12 and Cs2KTi3F12 show anomalies at approximately 1/3 of the full magnetic moment of Ti3+, which are a notable observation of signs of the theoretically proposed 1/3 magnetization plateau in S = 1/2 kagome antiferromagnets.

引用

页数：10

共 48 条

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