New S=1/2 Kagomé antiferromagnets A2Cu3SnF12: A=Cs and Rb
作者： K Kindo , H Uekusa , M Yano , K Fujii , K Morita
DOI: 10.1088/1742-6596/145/1/012005
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摘要: We synthesized single crystals of the new hexagonal compounds A2Cu3SnF12 with A=Cs and Rb, investigated their magnetic properties. These are composed Kagom? layers corner-sharing CuF6-octahedra. Cs2Cu3SnF12 has proper layer at room temperature, undergoes structural phase transition Tt ? 185 K. The temperature dependence susceptibility in agrees well result numerical calculation for S = 1/2 two-dimensional Heisenberg antiferromagnet down to nearest exchange interaction J/kB 240 Although deviates from calculated below T < Tt, rounded maxima were observed approximately (1/6)J/kB as predicted by theory. three-dimensional ordering TN 20 Rb2Cu3SnF12 layer, whose unit cell is enlarged 2a compared even temperature. From viewpoint crystal structure, interactions between neighbor Cu2+-ions classified into four kinds. high-field magnetization measurements, it was found that ground state a disordered singlet spin gap, recent Exact diagonalization method 12-site cluster performed analyze susceptibility. By comparing results experimental data, individual evaluated.
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