The perovskite ${\mathrm{YRuO}}_3$ containing low-spin $d^5{\mathrm{Ru}}^{3+}$ has a Pnma orthorhombic structure with elongated ${\mathrm{RuO}}_6$ octahedra evidencing orbital order and is insulating to low temperatures with a band gap of 70 meV. Canted antiferromagnetic ${\mathrm{Ru}}^{3+}$ spin order is observed below $T_{\mathrm{C}}=97\mathrm{K}$, and magnetization plateaus that emerge below 62 K reveal a quantum weak ferromagnetic state where 1/8 of the spins are reversed, reflecting extreme single-ion anisotropy resulting from the strong spin-orbit coupling of the $d^5{\mathrm{Ru}}^{3+}$ ion. Dynamic effects of the reversed spins give rise to an unusual negative AC susceptibility response, and a partial freezing of this motion occurs at 27 K.

中文翻译：

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YRuO3：量子弱铁磁体

钙钛矿 ${\mathrm{Ru}}_3$ 包含低旋转 $d^5{茹}^{3+}$具有Pnma正交晶体结构，具有细长$O_6$八面体证明轨道有序，并且以70 meV的带隙对低温绝缘。反铁磁斜面${茹}^{3+}$ 旋转顺序如下所示 ${Ť}_{\mathrm{C}}=97\mathrm{ķ}$，并且出现在62 K以下的磁化高原显示出量子弱的铁磁状态，其中1/8的自旋反转，反映了由于强自旋轨道耦合而产生的极端单离子各向异性。 $d^5{茹}^{3+}$离子。反向旋转的动态影响会引起异常的负AC磁化率响应，并且该运动在27 K时会部分冻结。