论文标题
BA6Y2RH2TI2O17-δ六边形钙钛矿中磁化二聚体的平面广泛的平面
Widely Spaced Planes of Magnetic Dimers in the Ba6Y2Rh2Ti2O17-δ Hexagonal Perovskite
论文作者
论文摘要
我们报告BA6Y2RH2TI2O17-δ的合成和初始表征，这是一种先前未报告的具有六边形对称结构的材料。面部共享rho6八面体形成了Rh2O9二聚体的三角平面，在垂直方向上广泛分离。由于存在RH离子，该材料显示出较小的有效磁矩和负的库里 - 韦斯温度。电荷传输和光条间隙非常相似，接近0.16 eV。观察到大于{μ0H= 2 tesla的施加的磁场，在1 K以下的温度下的热容量上的大幅度上升。尽管材料在低温下进行绝缘，但在特异性热中（γ= 166 MJ/mol F.U-K2）中有一个大的T线性项。这些结果表明在该材料中有旋转液态态的可能性。
We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material with a hexagonal symmetry structure. Face-sharing RhO6 octahedra form triangular planes of Rh2O9 dimers that are widely separated in the perpendicular direction. The material displays a small effective magnetic moment, due to the Rh ions present, and a negative Curie-Weiss temperature. The charge transport and optical band gaps are very similar, near 0.16 eV. A large upturn in the heat capacity at temperatures below 1 K, suppressed by applied magnetic fields larger than {μ0H = 2 Tesla, is observed. A large T-linear term in the specific heat (γ=166 mJ/mol f.u-K2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.
