The present study reports on the structural and magnetic phase transitions in Pr-doped polycrystalline Tb_0.6Pr_0.4MnO₃, using high-resolution neutron powder diffraction (NPD) collected at SINQ spallation source, to emphasize the suppression of the sinusoidal magnetic structure of pure TbMnO₃ and the evolution to a collinear A-type antiferromagnetic ordering. The phase purity, Jahn–Teller distortion, and one-electron bandwidth for e_g orbital of Mn³⁺ cation have been calculated for polycrystalline Tb_0.6Pr_0.4MnO_3, in comparison to the parent materials TbMnO₃ and PrMnO₃, through the Rietveld refinement study from x-ray diffraction data at room temperature, which reveals the GdFeO₃ type orthorhombic structure of Tb_0.6Pr_0.4MnO₃ having Pnma space group symmetry. The temperature-dependent zero field-cooled and field-cooled dc magnetization study at low temperature down to 5K reveals a variation in the magnetic phase transition due to the effect of Pr³⁺ substitution at the Tb³⁺ site, which gives the signature of the antiferromagnetic nature of the sample, with a weak ferromagnetic component at low temperature-induced by an external magnetic field. The field-dependent magnetization study at low temperatures gives the weak coercivity having the order of 2 kOe, which is expected due to the canted-spin arrangement or ferromagnetic nature of Terbium ordering. The NPD data for Tb_0.6Pr_0.4MnO₃ confirms that the nuclear structure of the synthesized sample maintains its orthorhombic symmetry down to 1.5K. Also, the magnetic structures have been solved at 50K, 25K, and 1.5K through the NPD study, which shows an A-type antiferromagnetic spin arrangement having the magnetic space group Pn′ma′.

本研究报告了 Pr 掺杂多晶 Tb _0.6 Pr _0.4 MnO ₃的结构和磁相变，使用在 SINQ 散裂源收集的高分辨率中子粉末衍射 (NPD)，强调对纯正弦磁结构的抑制。 TbMnO ₃和共线A型反铁磁排序的演变。与母体材料 TbMnO ₃和 PrMnO ₃相比，已计算多晶 Tb _0.6 Pr _0.4 MnO ₃的相纯度、Jahn-Teller 畸变和Mn ³⁺阳离子e _g轨道的单电子带宽，通过室温下 X 射线衍射数据的 Rietveld 细化研究，揭示了具有Pnma空间群对称性的 Tb _0.6 Pr _0.4 MnO ₃的 GdFeO ₃型斜方结构。在低至 5K 的低温下与温度相关的零场冷却和场冷却直流磁化研究揭示了由于Tb ³⁺处的Pr ³⁺取代效应导致的磁相变变化位置，它给出了样品的反铁磁性质的特征，在外部磁场引起的低温下具有弱铁磁成分。低温下的场相关磁化研究给出了具有 2 kOe 数量级的弱矫顽力，这是由于铽排序的倾斜自旋排列或铁磁性质所预期的。Tb _0.6 Pr _0.4 MnO ₃的 NPD 数据证实合成样品的核结构保持其正交对称性低至 1.5K。此外，通过 NPD 研究已经在 50K、25K 和 1.5K 处解决了磁结构，这显示了具有磁空间群Pn ' ma '的 A 型反铁磁自旋排列。