Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb$_2$Cu$_3$SnF$_{12}$

K. Morita; M. Yano; T. Ono; H. Tanaka; K. Fujii; H. Uekusa; Y. Narumi; K. Kindo

doi:10.1143/JPSJ.77.043707

Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb$_2$Cu$_3$SnF$_{12}$

Strongly Correlated Electrons 2009-11-13 v1

Authors: K. Morita , M. Yano , T. Ono , H. Tanaka , K. Fujii , H. Uekusa , Y. Narumi , K. Kindo

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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.

Keywords

kagome antiferromagnet singlet ground state spin gap Rb2Cu3SnF12 magnetic susceptibility exact diagonalization exchange interaction

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@article{arxiv.0803.0205,
  title  = {Singlet Ground State and Spin Gap in S=1/2 Kagome Antiferromagnet Rb$_2$Cu$_3$SnF$_{12}$},
  author = {K. Morita and M. Yano and T. Ono and H. Tanaka and K. Fujii and H. Uekusa and Y. Narumi and K. Kindo},
  journal= {arXiv preprint arXiv:0803.0205},
  year   = {2009}
}

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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 Rb$_2$Cu$_3$SnF$_{12}$

Abstract

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