论文标题
轨道非对角线旋转和电荷冷凝物在三个轨道模型中的作用，$ \ rm ca_2ruo_4 $ - 库仑重生旋转轨耦合，轨道磁矩和可调磁顺序
Role of orbital off-diagonal spin and charge condensates in a three orbital model for $\rm Ca_2RuO_4$ -- Coulomb renormalized spin-orbit coupling, orbital moment, and tunable magnetic order
论文作者
论文摘要
在完全自我一致的方法中获得了强烈各向异性的自旋轨道耦合（SOC）重新归一化和强烈增强的轨道磁矩，包括轨道偏高的旋转旋转和电荷冷凝物。对于中等四方变形，如$ \ rm ca_2 ruo_4 $，在晶体$ c $ axis中占据了较小的矩。为了减少四方失真，我们找到了一个可调式的策略，其中可以通过裸露的SOC强度和八面体倾斜幅度来调整磁顺序（AFM或FM）。在这种制度中，随着四方变形的减少，AFM订单可以通过逐渐减少八面体倾斜来维持，如$ \ rm ca_ {2-x} sr_x ruo_4 $所观察到的那样。对于纯平面订单，唯一的自我一致解决方案是沿Crystal $ b $轴的FM订单，这与双层截形化合物$ \ rm ca_3 ru_2 o_7 $相关。
Strongly anisotropic spin-orbit coupling (SOC) renormalization and strongly enhanced orbital magnetic moments are obtained in the fully self consistent approach including the orbital off-diagonal spin and charge condensates. For moderate tetragonal distortion as in $\rm Ca_2 RuO_4$, dominantly planar antiferromagnetic (AFM) order with small canting of moments in and about the crystal $c$ axis are obtained. For reduced tetragonal distortion, we find a tunable regime wherein the magnetic order can be tuned (AFM or FM) by the bare SOC strength and octahedral tilting magnitude. In this regime, with decreasing tetragonal distortion, AFM order is maintained by progressively decreasing octahedral tilting, as observed in $\rm Ca_{2-x}Sr_x RuO_4$. For purely planar order, the only self consistent solution is FM order along crystal $b$ axis, which is relevant for the bilayer ruthenate compound $\rm Ca_3 Ru_2 O_7$.
