从自旋冰到自旋液态的渡越——结构与磁性质的演化

使用固相反应法得到了Ho_2-xTb_xTi₂O₇（x=0，05，1，15，2）系列多晶样品.X射线衍射（XRD）实验与2K到300K温度区间的直流磁化率测量结果显示，随着Tb即是x的增加，体系由自旋冰Ho₂Ti₂O₇向自旋液Tb₂Ti₂O_{7关键词： 自旋冰 自旋液体 自旋阻挫 晶格结构}

Transition from spin ice to spin liquid-evolvement of structure and magnetic properties

The polycrystal samples of Ho_2-xTb_xTi_2O_7(x=0,0.5,1,1 .5,2) were prepared by solid reaction method. The result of X-ray diffraction (XRD) and dc susceptibility measurement from 2 K to 300 K both indicate that as the content of Tb~3+,i.e. x,increases,the system crosses over from Ho_2Ti_2O_7spin ice to Tb_2Ti_2O_7 spin liquid,the lattice constant of cubic pyrochlore increases,while the Curie constant and effective magnetic moment decrease. Especially,the Curie-Weiss temperature decreases from positive to n...