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  Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO3

Nair, H. S., Fu, Z., Kumar, C. M. N., Pomjakushin, V. Y., Xiao, Y., Chatterji, T., et al. (2015). Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO3. EPL, 110(3): 37007, pp. 1-6. doi:10.1209/0295-5075/110/37007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-D18C-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1CBE-B
Genre: Journal Article

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Nair, Harikrishnan S.1, Author
Fu, Zhendong1, Author
Kumar, C. M. N.1, Author
Pomjakushin, V. Y.1, Author
Xiao, Yinguo1, Author
Chatterji, Tapan1, 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: Strong spin-lattice coupling and prominent frustration effects observed in the 50 Fe-doped frustrated hexagonal IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn1.gif] (h)̑ext{LuMnO}_3} are reported. A Néel transition at IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn2.gif] {T_{\mathrm{N}}≈112\ ̑ext{K}} and a possible spin re-orientation transition at IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn3.gif] {T_{\mathrm{SR}}≈55\ ̑ext{K}} are observed in the magnetization data. From neutron powder diffraction data, the nuclear structure at and below 300 K was refined in polar P 6 3 cm space group. While the magnetic structure of LuMnO 3 belongs to the IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn4.gif] {Γ_4\ (P6'_3c'm)} representation, that of LuFe 0.5 Mn 0.5 O 3 belongs to IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn5.gif] {Γ_1\ (P6_3cm)} which is supported by the strong intensity for the (100) reflection and also judging by the presence of spin-lattice coupling. The refined atomic positions for Lu and Mn/Fe indicate significant atomic displacements at IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn6.gif] {T_{\mathrm{N}}} and IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn7.gif] {T_{\mathrm{SR}}} which confirms strong spin-lattice coupling. Our results complement the discovery of room temperature multiferroicity in thin films of IMG [http://ej.iop.org/images/0295-5075/110/3/37007/epl17080ieqn8.gif] {h̑ext{LuFeO}_3 and would give impetus to study LuFe 1− x Mn x O 3 systems as potential multiferroics where electric polarization is linked to giant atomic displacements.

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Language(s): eng - English
 Dates: 2015-05-192015-05-19
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1209/0295-5075/110/37007
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Title: EPL
  Other : Europhysics Letters
Source Genre: Journal
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Publ. Info: Bristol : IoPP
Pages: - Volume / Issue: 110 (3) Sequence Number: 37007 Start / End Page: 1 - 6 Identifier: Other: 0295-5075
CoNE: /journals/resource/0295-5075