Study of frustrated rare-earth intermetallic compounds

我们发现了YbAl_3C_3的金属复合物，显示了低温度下的自旋单地面状态。第一个激动人心的三重奏状态的结构，开发人员快速地在10K以下，直接由具有更高能量分辨率的非弹性中子散射实验进行分类。旋转的单一地面状态从来没有被观测到在4f电子系统中。两个尺寸的粗糙三角形晶格和低载波密度在旋转单地面状态的现实化中扮演一个重要的角色。按顺序研究YbAl_3C_3的物理性质，我们有同步加速器X射线衍射、核磁共振和NQR、特定的热量、磁性化、电抵抗力和弹性恒定测量。

We found that the intermetallic compound YbAl_3C_3 exhibits an spin-singlet ground state at low temperatures. The structure of the first excited triplet state, which develops rapidly below 10K, is directly clarified by inelastic neutron scattering experiments with a higher energy resolution. The spin-singlet ground state has never been observed in 4f electron systems. The two-dimensional frustrated triangular lattice and the low carrier density play an important role in the realization of the spin-singlet ground state. In order to investigate physical properties of YbAl_3C_3, we have performed synchrotron X-ray diffraction, NMR・NQR, specific heat, magnetization, electrical resistivity and elastic constant measurements.