Evolution from sinusoidal to collinear A-type antiferromagnetic spin-ordered magnetic phase transition in TbPrMnOsolid solution.

The present study reports on the structural and magnetic phase transitions in Pr-doped polycrystalline TbPrMnO, using high-resolution neutron powder diffraction (NPD) collected at SINQ spallation source, to emphasize the suppression of the sinusoidal magnetic structure of pure TbMnOand the evolution to a collinear A-type antiferromagnetic ordering. The phase purity, Jahn-Teller distortion, and one-electron bandwidth for eorbital of Mncation have been calculated for polycrystalline TbPrMnOin comparison to the parent materials TbMnOand PrMnO, through the Rietveld refinement study from x-ray diffraction data at room temperature, which reveals the GdFeOtype orthorhombic structure of TbPrMnOhavingspace group symmetry. The temperature-dependent zero field-cooled and field-cooled dc magnetization study at low temperature down to 5 K reveals a variation in the magnetic phase transition due to the effect of Prsubstitution at the Tbsite, 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 TbPrMnOconfirms that the nuclear structure of the synthesized sample maintains its orthorhombic symmetry down to 1.5 K. Also, the magnetic structures have been solved at 50 K, 25 K, and 1.5 K through the NPD study, which shows an A-type antiferromagnetic spin arrangement having the magnetic space group''.