Magnetization spin reversal and neutron diffraction study of polycrystalline Tb&lt;sub&gt;0.55&lt;/sub&gt;Sr&lt;sub&gt;0.45&lt;/sub&gt;MnO&lt;sub&gt;3&lt;/sub&gt;

Agarwal, Harshit; Alonso, Jose A.; Muñoz, Ángel; Choudhary, R.J.; Srivastava, O.N.; Shaz, M.A.

doi:10.1016/j.jallcom.2020.156355

Magnetization spin reversal and neutron diffraction study of polycrystalline Tb_0.55Sr_0.45MnO₃

Agarwal H, Alonso JA, Muñoz Á, Choudhary RJ, Srivastava ON & Shaz MA

Citation

Agarwal, H., Alonso, J. A., Muñoz, Á., Choudhary, R. J., Srivastava, O. N., & Shaz, M. A. (2020). Magnetization spin reversal and neutron diffraction study of polycrystalline Tb_0.55Sr_0.45MnO₃. Journal of Alloys and Compounds, 845, 156355 (12 pp.). https://doi.org/10.1016/j.jallcom.2020.156355

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:33848

We have investigated the structural and magnetic phase transitions in Sr doped polycrystalline Tb_0.55Sr_0.45MnO₃, using temperature-dependent high-resolution neutron powder diffraction in the HRPT diffractometer at PSI to address the origin of magnetization reversal at low temperature. The solid solution Tb_0.55Sr_0.45MnO₃ crystallizes in O′ type orthorhombic structure having the Pnma symmetry. The substitution of the divalent cation of Sr²⁺ at the site of Tb³⁺ dilutes the Mn-Tb interaction and affects the magnetic structure, which was observed by the field and temperature-dependent dc magnetization and neutron diffraction study. The temperature-dependent zero field-cooled and field cooled dc magnetization study reveals the indication of spin reversal phenomena, which is the nature of canted antiferromagnetic or ferrimagnetic transition at 100 Oe because of Mn-Mn sub-lattices interaction below 65 K. By increasing the applied magnetic field up to 20 kOe, a weak ferromagnetic type of behaviour is observed. The field-dependent magnetization shows weak coercivity due to the canted spin structure at low temperatures. The low-temperature neutron diffraction study of polycrystalline Tb_0.55Sr_0.45MnO₃ reveals the non-collinear canted antiferromagnetic structure due to Tb ordering at 1.5 K, which turns into a non-collinear ferromagnetic structure along with spin canting followed by the spin reversal phenomena at 25 K.