2020/11/30 by Harshit Agarwal, José Antonio Alonso, Jose A Alonso +4
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Crystallite #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetic structure #Magnetization #Multiferroics and related materials #Neutron diffraction #Orthorhombic crystal system #Rietveld refinement #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/1361-648x/abfc14
21 Pages, 8 Figures, 7 Tables
arxiv created 2021/02/08 · openalex created_date 2021/02/15 · openalex publication_date 2021/04/27 · arxiv updated 2021/07/07 · openalex updated_date 2026/08/05
Abstract The present study reports on the structural and magnetic phase transitions in Pr-doped polycrystalline Tb 0.6 Pr 0.4 MnO 3 , using high-resolution neutron powder diffraction (NPD) collected at SINQ spallation source, to emphasize the suppression of the sinusoidal magnetic structure of pure TbMnO 3 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 Mn 3+ cation have been calculated for polycrystalline Tb 0.6 Pr 0.4 MnO 3, in comparison to the parent materials TbMnO 3 and PrMnO 3 , through the Rietveld refinement study from x-ray diffraction data at room temperature, which reveals the GdFeO 3 type orthorhombic structure of Tb 0.6 Pr 0.4 MnO 3 having Pnma space 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 Pr 3+ substitution at the Tb 3+ 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 0.6 Pr 0.4 MnO 3 confirms 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 Pn ′ ma ′.