Singlet Ground State and Spin Gap in S = 1/2 Kagomé Antiferromagnet Rb2Cu3SnF12
Singlet Ground State and Spin Gap in S = 1/2 Kagomé Antiferromagnet Rb2Cu3SnF12
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DOI：
10.1143/jpsj.77.043707
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发表时间：
2008-03
影响因子：
1.7
通讯作者：
K. Morita;M. Yano;T. Ono;Hidekazu Tanaka;K. Fujii;H. Uekusa;Y. Narumi;K. Kindo
中科院分区：
文献类型：
--
作者：
K. Morita;M. Yano;T. Ono;Hidekazu Tanaka;K. Fujii;H. Uekusa;Y. Narumi;K. Kindo
用单晶法研究了rb2cu3snf12的晶体结构和磁性能。该化合物由角共享cuf6八面体的Kagome层组成，与适当的Kagome层相比，具有2 a ×2 a的放大细胞。Rb 2 Cu 3 snf12具有S = 1/2修饰的Kagome反铁磁体，具有4种相邻交换相互作用。从磁化率和强磁场测量中发现，基态是一个无序的单重态，具有自旋间隙，这与最近的理论预测一致。对12个位点的Kagome簇进行精确对角化分析磁化率，并评估个体交换相互作用。
We investigated the crystal structure of Rb 2 Cu 3 SnF 12 and its magnetic properties using single crystals. This compound is composed of Kagome layers of corner-sharing CuF 6 octahedra with a 2 a ×2 a enlarged cell as compared with the proper Kagome layer. Rb 2 Cu 3 SnF 12 is magnetically described as an S = 1/2 modified Kagome antiferromagnet with four kinds of neighboring exchange interaction. From magnetic susceptibility and high-field magnetization measurements, it was found that the ground state is a disordered singlet with the spin gap, as predicted from a recent theory. Exact diagonalization for a 12-site Kagome cluster was performed to analyze the magnetic susceptibility, and individual exchange interactions were evaluated.