亚稳态钌中Jahn-Teller驱动的垂直磁晶各向异性
Jahn-Teller driven perpendicular magnetocrystalline anisotropy in metastable Ruthenium
摘要：
一个新的亚稳相的体心-四钌（{ \em bct}-Ru）被确定为表现出大的垂直磁晶各向异性（PMCA），其能量，$E_{MCA}$，高达150 $μ$ eV/atom，两个数量级以上的3 $d$磁性金属。在四元畸变范围内的进一步研究表明，{ \em bct}-Ru中磁性的出现是由Jahn-Teller spit $e_g$轨道控制的。此外，从频带分析，MCA主要由两个$e_g$状态，$d_{x^2-y^2}$和$d_{z^2}$状态之间的相互作用决定，作为与四重态失真相关的电平反转的结果。
英文摘要：
A new metastable phase of the body-centered-tetragonal ruthenium ({\em bct}--Ru) is identified to exhibit a large perpendicular magnetocrystalline anisotropy (PMCA), whose energy, $E_{MCA}$, is as large as 150 $μ$eV/atom, two orders of magnitude greater than those of 3$d$ magnetic metals. Further investigation over the range of tetragonal distortion suggests that the appearance of the magnetism in the {\em bct}--Ru is governed by the Jahn-Teller spit $e_g$ orbitals. Moreover, from band analysis, MCA is mainly determined by an interplay between two $e_g$ states, $d_{x^2-y^2}$ and $d_{z^2}$ states, as a result of level reversal associated with tetragonal distortion.
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