paper

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb $_{2}$ Cu $_{3}$ SnF $_{12}$

arXiv:0803.0205 · doi:10.1143/JPSJ.77.043707

Abstract

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 2a x 2a 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.

5 pages, 4 figures, To appear in J. Phys. Soc. Jpn. Vol. 77 No. 4

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb2​Cu3​SnF12​

Abstract

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb $_{2}$ Cu $_{3}$ SnF $_{12}$