论文标题
轨道纠缠的抗铁磁管订单和旋转轨道抗速度激子$ \ rm sr_2vo_4 $
Orbital entangled antiferromagnetoc order and spin-orbit-distortion exciton in $\rm Sr_2VO_4$
论文作者
论文摘要
$ \ rm sr_2vo_4 $化合物中的电子填充$ n = 1 $，由于四方畸变诱导的晶体场调谐，八面体协调的$ t _ {\ rm 2g} $轨道非常活跃。考虑到晶体场在现实的三轨模型中诱导的四方分裂，使用广义自我一致和波动的方法研究了集体自旋轨道激发。获得的自我一致状态的种类，包括轨道纠缠的铁磁和抗铁磁磁序，反映出由频带，旋转轨道耦合，晶体场和库仑相互作用项之间的相互作用而产生的丰富自旋轨道物理。在高压研究中，从易感性和电阻率异常中获得的压力的集体激发的计算能量量表与晶体场的集体激发量表的行为是一致的。
With electron filling $n=1$ in the $\rm Sr_2VO_4$ compound, the octahedrally coordinated $t_{\rm 2g}$ orbitals are strongly active due to tetragonal distortion induced crystal field tuning by external agent such as pressure. Considering the full range of crystal field induced tetragonal splitting in a realistic three-orbital model, collective spin-orbital excitations are investigated using the generalized self consistent and fluctuation approach. The variety of self consistent states obtained including orbital entangled ferromagnetic and antiferromagnetic orders reflects the rich spin-orbital physics resulting from the interplay between the band, spin-orbit coupling, crystal field, and Coulomb interaction terms. The behavior of the calculated energy scales of collective excitations with crystal field is consistent with that of the transition temperatures with pressure as obtained from susceptibility and resistivity anomalies in high-pressure studies.
