论文标题
3 $ d $ -5 $ d $过渡金属的双重磁力的非平凡磁性的研究
Study of Nontrivial Magnetism in 3$d$-5$d$ Transition Metal based Double Perovskites
论文作者
论文摘要
密切相关的3 $ d $过渡金属（TM）原子与5 $ d $ tm ATOM的强旋转轨道耦合（SOC）的共存可能有可能产生异国情调的物理现象。在目前的工作中，我们研究了由于La $ _2 $ coiro $ _6 $（LCIO）的共存而产生的磁性，这是批量3 $ d $ -5 $ -5 $ d $ d $ double double perovskites的代表。为了进一步深入了解共同$ d $状态对IR-$ d $州的影响，进行了比较，与ISSTRUCTURal LA $ _2 $ zniro $ _6 $进行了比较，在该$ _6 $中，非磁性Zn Atom代替了CO ATOM。 An in-depth analysis of the magnetic states in the framework of first principles calculation, using Landau theory and magnetic multipole analysis shows that the magnetism at the two constituent TM atoms in LCIO are driven by two different magnetic order parameters, viz., the spin moment as the primary order parameter responsible for the broken time-reversal state in Co and the higher order multipole: triakontadipole for the Ir magnetic state.进一步表明，与多极分析一致，对IR- $ t_ {2g} $轨道的紧密结合分析表明，Ir- $ d $状态几乎不受共同$ d $状态的影响。可以在中子衍射测量中探测相关多物的计算继承结构，从而激发了该方向的进一步实验。
The coexistence of the strongly correlated 3$d$ transition metal (TM) atom and the strong spin-orbit coupling (SOC) of 5$d$ TM atom is potential to host exotic physical phenomena. In the present work, we have studied the magnetism resulting from such a coexistence in La$_2$CoIrO$_6$ (LCIO), a representative of bulk 3$d$-5$d$ double perovskites. In order to gain further insight into the effect of Co-$d$ states on the Ir-$d$ states, comparisons are carried out with the isostructural La$_2$ZnIrO$_6$, where nonmagnetic Zn atom replaces the Co atom. An in-depth analysis of the magnetic states in the framework of first principles calculation, using Landau theory and magnetic multipole analysis shows that the magnetism at the two constituent TM atoms in LCIO are driven by two different magnetic order parameters, viz., the spin moment as the primary order parameter responsible for the broken time-reversal state in Co and the higher order multipole: triakontadipole for the Ir magnetic state. A tight-binding analysis with the Ir-$t_{2g}$ orbitals, further, indicate that the Ir-$d$ states are hardly affected by the Co-$d$ states, in agreement with the multipole analysis. The computed heirarchy of the relevant multipoles in the present work can be probed in neutron diffraction measurements, motivating further experiments in this direction.
