Exotic quantum liquid state on new kagome antiferromagnets

新型戈薇反铁磁体上的奇异量子液态

• 批准号: 21740249
• 负责人: ONO Toshio
• 金额: $ 2.91万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740249/
• 关键词: 物性実験; 磁性フラストレーション系; 磁性; フラストレーション系; 中性子散乱; 低温物性; 量子スピン系; スピン液体; カゴメ格子

The ground states and the magnetic excitation spectra were investigated by means of the magnetic measurements and the neutron scattering experiments for new S=1/2 kagome antiferromagnets Rb_2Cu_3SnF_<12> and Cs_2Cu_3SnF_<12>. For Rb_2Cu_3SnF_<12>, the ground state is non-magnetic, and the spin state is described by "pinwheel" valence-bond-solid state. On the other hand, for Cs_2Cu_3SnF_<12>, q=0 spin structure is realized below Neel temperature T_N=20K. Detailed spin structure and the dispersion of the spin waves are under way.

本文用磁测量和中子散射实验研究了新的S=1/2 kagome反铁磁体Rb_2Cu_3SnF_2和Cs_2Cu_3SnF_2的基态和磁激发谱<12><12>。对于Rb_2Cu_3SnF_<12>，基态是非磁性的，自旋态用“风车”价键固态描述。而对于Cs_2Cu_3SnF_<12>，在低于Neel温度T_N= 20 K时，实现了q=0自旋结构。详细的自旋结构和自旋波的色散正在进行中。