Magnetic structures and magnetic phase transitions in the Mn-doped orthoferrite 
TbFeO3 studied by neutron powder diffraction

Nair, Harikrishnan S.; Chatterji, Tapan; Kumar, C. M. N.; Hansen, Thomas; Nhalil, Hariharan; Elizabeth, Suja; Strydom, André M.

doi:10.1063/1.4940958

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Magnetic structures and magnetic phase transitions in the Mn-doped orthoferrite TbFeO₃ studied by neutron powder diffraction

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Strydom, André M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nair, H. S., Chatterji, T., Kumar, C. M. N., Hansen, T., Nhalil, H., Elizabeth, S., et al. (2016). Magnetic structures and magnetic phase transitions in the Mn-doped orthoferrite TbFeO₃ studied by neutron powder diffraction. Journal of Applied Physics, 119(5): 053901, pp. 1-7. doi:10.1063/1.4940958.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-D34F-C

Abstract

The magnetic structures and the magnetic phase transitions in the Mn-doped orthoferrite TbFeO3 studied using neutron powder diffraction are reported. Magnetic phase transitions are identified at T-N(Fe/Mn) approximate to 295K where a paramagnetic-to-antiferromagnetic transition occurs in the Fe/Mn sublattice, T-SR(Fe/Mn) approximate to 26K where a spin-reorientation transition occurs in the Fe/Mn sublattice and T-N(R) approximate to 2K where Tb-ordering starts to manifest. At 295 K, the magnetic structure of the Fe/Mn sublattice in TbFe0.5Mn0.5O3 belongs to the irreducible representation Gamma(4) (G(x)A(y)F(z) or Pb'n'm). A mixed-domain structure of (Gamma(1) + Gamma(4)) is found at 250K which remains stable down to the spin re-orientation transition at T-SR(Fe/Mn) approximate to 26K. Below 26K and above 250 K, the majority phase (>80%) is that of Gamma(4). Below 10K the high-temperature phase Gamma(4) remains stable till 2K. At 2 K, Tb develops a magnetic moment value of 0.6(2) mu(B)/f.u. and orders long-range in F-z compatible with the Gamma(4) representation. Our study confirms the magnetic phase transitions reported already in a single crystal of TbFe0.5Mn0.5O3 and, in addition, reveals the presence of mixed magnetic domains. The ratio of these magnetic domains as a function of temperature is estimated from Rietveld refinement of neutron diffraction data. Indications of short-range magnetic correlations are present in the low-Q region of the neutron diffraction patterns at T < T-SR(Fe/Mn). These results should motivate further experimental work devoted to measure electric polarization and magnetocapacitance of TbFe0.5Mn0.5O3. (C) 2016 AIP Publishing LLC.