Tuning of magnetic ordering by Y substitution onto Tb site in the nanocrystalline TbMnO3

Chakraborty, Keka R. ; Shukla, Rakesh ; Kaushik, S. D. ; Mukadam, M. D. ; Siruguri, V. ; Tyagi, A. K. ; Yusuf, S. M. (2015) Tuning of magnetic ordering by Y substitution onto Tb site in the nanocrystalline TbMnO3 Journal of Applied Physics, 118 (16). Article ID 164307. ISSN 0021-8979

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Official URL: http://aip.scitation.org/doi/10.1063/1.4934251

Related URL: http://dx.doi.org/10.1063/1.4934251


We report the magnetic properties, of nano-crystalline powders Tb1−xYxMnO3 (x = 0, 0.1, 0.2, 0.3 and 0.4), as perceived by neutron diffraction, and elucidate the effect of Tb site substitution on the magnetic structure of TbMnO3. All samples crystallized in the orthorhombic structure conforming to space group Pnma, and exhibited an incommensurate collinear antiferromagnetic ordering of the Mn ions below ∼40 K. Furthermore, at T≤ 20 K, all these samples showed a change in magnetic structure (of Mn moments) to a spiral ordering down to 2 K, the lowest measured temperature. For the samples with x = 0, 0.1, and 0.2, a short-ranged two dimensional (2D) ordering of Tb moments was also observed at 2 K. However, for the other samples (x = 0.3 and 0.4), no magnetic ordering of Tb moments was found down to 2 K. So with Y substitution, a crossover from 2D ordering to a disordering of Tb moments was observed. The moments at the Mn site were found to be lower than the full Mn3+ (4μB) moment for all the samples below 40 K. The magnetic properties of all the samples studied by us in nano form are more pronounced than those of the reported single crystals of same compositions.

Item Type:Article
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Deposited On:01 Dec 2017 11:47
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