Spin-reorientation phase transitions that involve the rotation of a crystal’s magnetization have been well characterized in distorted-perovskite oxides such as orthoferrites. In these systems spin reorientation occurs due to competing rare-earth and transition metal anisotropies coupled via $f\text{−}d$ exchange. Here, we demonstrate an alternative paradigm for spin reorientation in distorted perovskites. We show that the $R_2{\mathrm{CuMnMn}}_4{\mathrm{O}}_{12}$ ($R=\mathrm{Y}$ or Dy) triple $A$-site columnar-ordered quadruple perovskites have three ordered magnetic phases and up to two spin-reorientation phase transitions. Unlike the spin-reorientation phenomena in other distorted perovskites, these transitions are independent of rare-earth magnetism, but are instead driven by an instability towards antiferromagnetic spin canting likely originating in frustrated Heisenberg exchange interactions, and the competition between Dzyaloshinskii-Moriya and single-ion anisotropies.

中文翻译：

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反铁磁自旋倾斜驱动的亚铁磁自发旋转

自旋取向相变涉及晶体磁化的旋转，已在畸变的钙钛矿氧化物（如正铁氧体）中得到了很好的表征。在这些系统中，由于稀土竞争和过渡金属各向异性通过$F\text{-}d$交换。在这里，我们演示了变形钙钛矿中自旋重定向的替代范例。我们表明${\mathrm{[R}}_2{\mathrm{铜锰锰}}_4{\mathrm{Ø}}_{12}$ （$\mathrm{[R}=\mathrm{ÿ}$ 或Dy）三重 $\mathrm{一种}$位点柱状有序四方钙钛矿具有三个有序磁性相和最多两个自旋取向相变。与其他扭曲的钙钛矿中的自旋取向现象不同，这些转变与稀土磁无关，而是由可能因沮丧的海森堡交换相互作用导致的反铁磁自旋倾斜的不稳定性以及Dzyaloshinskii-Moriya与单晶硅之间的竞争所驱动。离子各向异性。