论文标题
tb $ _ {2} $ ti $ _ {2} $ o $ $ $ $ _ {7} $的低能磁电磁
Low Energy Magneto-optics of Tb$_{2}$Ti$_{2}$O$_{7}$ in [111] Magnetic Field
论文作者
论文摘要
Pyrochlore磁铁TB $ _ {2} $ ti $ _ {2} $ o $ $ _ {7} $显示出缺乏低温的磁性，被认为是量子旋转液体候选者。我们在高质量的TB $ _ {2} $ ti $ _ {2} $ o $ $ _ {7} $ Crystal上进行高质量的TB $ _ {2} $ crystal，并研究低能激发作为[111]磁场具有高能量分辨率的函数的函数。低能晶体场激发在磁场下异常地改变了能量。尽管有几次急剧依赖性的变化，但我们表明材料的频谱可以通过相变的形式来描述，而是通过低能晶体场水平之间的场依赖性杂交来描述。我们强调了tb $ _ {2} $ ti $ _ {2} $ o $ $ _ {7} $之间的自旋和晶格自由度之间的强耦合，这是磁场可调晶体场环境所证明的。基于单个离子物理学的计算晶体场环境的对称性降低可以再现我们的数据。
The pyrochlore magnet Tb$_{2}$Ti$_{2}$O$_{7}$ shows a lack of magnetic order to low temperatures and is considered to be a quantum spin liquid candidate. We perform time-domain THz spectroscopy on high quality Tb$_{2}$Ti$_{2}$O$_{7}$ crystal and study the low energy excitations as a function of [111] magnetic field with high energy resolution. The low energy crystal field excitations change their energies anomalously under magnetic field. Despite several sharp field dependent changes, we show that the material's spectrum can be described not by a phase transitions, but by field dependent hybridization between the low energy crystal field levels. We highlight the strong coupling between spin and lattice degrees of freedom in Tb$_{2}$Ti$_{2}$O$_{7}$ as evidenced by the magnetic field tunable crystal field environment. Calculations based on single ion physics with field induced symmetry reduction of the crystal field environment can reproduce our data.
