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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-D34F-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-31A9-4
Genre: Journal Article

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 Creators:
Nair, Harikrishnan S.1, Author
Chatterji, Tapan1, Author
Kumar, C. M. N.1, Author
Hansen, Thomas1, Author
Nhalil, Hariharan1, Author
Elizabeth, Suja1, Author
Strydom, André M.2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 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.

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Language(s): eng - English
 Dates: 2016-02-072016-02-07
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000369900600006
DOI: 10.1063/1.4940958
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Title: Journal of Applied Physics
  Abbreviation : J. Appl. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : AIP Publishing
Pages: - Volume / Issue: 119 (5) Sequence Number: 053901 Start / End Page: 1 - 7 Identifier: ISSN: 0021-8979
CoNE: /journals/resource/991042723401880