Abstract The crystal structure, magnetic properties and electronic structures of LuCr1-xMnxO3 (x = 0, 0.1, 0.2, and 0.3) series samples were systematically investigated. The crystal structure of the Mn-doped LuCrO3 samples is orthorhombic structure with Pbnm, consistent with the pristine LuCrO3. Synchrotron radiation x-ray absorption spectroscopy of Mn 2p, Cr 2p and O 1s core levels show that Cr ion is trivalent and its valence state does not change with doping. However, the valence state of Mn ions for samples with x = 0.1 and 0.3 is mainly in Mn2+ while it is dominated by Mn3+ for the sample x = 0.2. This leads to the diversely unoccupied 3d states of transitional metal ions, which hybridized with O 2p levels. The energy diagram of each transitional metal ions in our samples were provided. More interesting, magnetic data shows the negative magnetization in zero-field-cooling MZFC(T) curve below TN. And the evolution of MFC(T) and MZFC(T) curves coming to converge and intersect with each other are caused by Mn doping. Also, multiple magnetic phases with a new magnetic phase transition at 30 K were induced by the effect of Mn doping. Our results demonstrate that the antiferromagnetic coupling of Mn2+ being antiparallel with spin moment of Cr3+ is favor of the magnetization switching while the ferromagnetic coupling of Mn3+ overcomes the Cr3+ ions ordering and destroys the magnetization switching.

中文翻译：

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Mn掺杂对LuCrO 3 磁化转换的影响

摘要 系统研究了LuCr1-xMnxO3 (x = 0、0.1、0.2和0.3)系列样品的晶体结构、磁性和电子结构。Mn 掺杂的 LuCrO3 样品的晶体结构是与 Pbnm 的正交结构，与原始的 LuCrO3 一致。Mn 2p、Cr 2p 和O 1s 核心能级的同步辐射X 射线吸收光谱表明，Cr 离子是三价的，其价态不随掺杂而改变。然而，对于 x = 0.1 和 0.3 的样品，Mn 离子的价态主要在 Mn2+ 中，而对于样品 x = 0.2 则以 Mn3+ 为主。这导致过渡金属离子的各种未占据的 3d 态与 O 2p 能级杂交。提供了我们样品中每种过渡金属离子的能量图。更有意思的，磁性数据显示在 TN 以下零场冷却 MZFC(T) 曲线中的负磁化强度。而 MFC(T) 和 MZFC(T) 曲线逐渐收敛和相交的演变是由 Mn 掺杂引起的。此外，由于 Mn 掺杂的影响，在 30 K 处具有新的磁性相变的多个磁性相被诱导。我们的结果表明，Mn2+ 与 Cr3+ 的自旋矩反平行的反铁磁耦合有利于磁化转换，而 Mn3+ 的铁磁耦合克服了 Cr3+ 离子排序并破坏了磁化转换。通过 Mn 掺杂的影响，在 30 K 处产生了具有新磁相变的多个磁相。我们的结果表明，Mn2+ 与 Cr3+ 的自旋矩反平行的反铁磁耦合有利于磁化转换，而 Mn3+ 的铁磁耦合克服了 Cr3+ 离子排序并破坏了磁化转换。通过 Mn 掺杂的影响，在 30 K 处产生了具有新磁相变的多个磁相。我们的结果表明，Mn2+ 与 Cr3+ 的自旋矩反平行的反铁磁耦合有利于磁化转换，而 Mn3+ 的铁磁耦合克服了 Cr3+ 离子排序并破坏了磁化转换。