Journal Article

FZJ-2015-07119

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO 3

Nair, H. S. (Corresponding author) ; Fu, Z.FZJ* ; Kumar, C. M. N. ; Pomjakushin, V. Y. ; Xiao, Y.FZJ* ; Chatterji, T. ; Strydom, A. M.

2015
EDP Science65224 Les-Ulis

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Please use a persistent id in citations: http://hdl.handle.net/2128/9545  doi:10.1209/0295-5075/110/37007

Abstract: Strong spin-lattice coupling and prominent frustration effects observed in the 50% Fe-doped frustrated hexagonal $(h)\text{LuMnO}_3$ are reported. A Néel transition at $T_{\mathrm{N}}\approx112\ \text{K}$ and a possible spin re-orientation transition at $T_{\mathrm{SR}}\approx55\ \text{K}$ are observed in the magnetization data. From neutron powder diffraction data, the nuclear structure at and below 300 K was refined in polar P63cm space group. While the magnetic structure of LuMnO3 belongs to the $\Gamma_4\ (P6'_3c'm)$ representation, that of LuFe0.5Mn0.5O3 belongs to $\Gamma_1\ (P6_3cm)$ 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 $T_{\mathrm{N}}$ and $T_{\mathrm{SR}}$ which confirms strong spin-lattice coupling. Our results complement the discovery of room temperature multiferroicity in thin films of $h\text{LuFeO}_3$ and would give impetus to study LuFe1−x Mn x O3 systems as potential multiferroics where electric polarization is linked to giant atomic displacements.

Keyword(s): Magnetic Materials (1st) ; Key Technologies (1st) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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