Raman effect and magnetic properties of doped TbMnO3

A Kumar, P Shahi, S Kumar, KK Shukla… - Journal of Physics D …, 2013 - iopscience.iop.org
Journal of Physics D: Applied Physics, 2013iopscience.iop.org
The room temperature Raman scattering, structural and temperature variation of magnetic
properties of Y-and Ni-doped TbMnO 3 are investigated. Both for Y and Ni doping, the Néel
temperature (TN) decreases. Y doping reduces effectively both the J Tb–Tb and J Mn–Mn
exchange interactions, whereas Ni doping on the Mn site decreases only the J Mn–Mn
exchange interaction. The reduction in TN in the Ni-doped sample cannot be explained with
simple exchange integral. It might be the case that Ni 2+ doping changes the polarization …
Abstract
The room temperature Raman scattering, structural and temperature variation of magnetic properties of Y-and Ni-doped TbMnO 3 are investigated. Both for Y and Ni doping, the Néel temperature (T N) decreases. Y doping reduces effectively both the J Tb–Tb and J Mn–Mn exchange interactions, whereas Ni doping on the Mn site decreases only the J Mn–Mn exchange interaction. The reduction in T N in the Ni-doped sample cannot be explained with simple exchange integral. It might be the case that Ni 2+ doping changes the polarization flop observed in TbMnO 3 which in effect may change the exchange interaction. In the room temperature Raman spectra for TbMnO 3 and Y-doped TbMnO 3 eight modes are observed. When Ni is doped, modes due to MnO 6 bending and in-plane O 2 stretching broaden and few modes disappear due to the induced lattice disorder.
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