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Issue 2, 2017
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Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1−xO3

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Abstract

This study provides a comprehensive insight into the effects of controlled off-stoichiometry on the structural and multiferroic properties of the hexagonal manganite LuMn1−xO3+δ (x = 0.02; δ ∼ 0), supported by neutron powder diffraction measurements confirming single phase P63cm symmetry and evidencing a relevant ferromagnetic component, below TN ∼ 90 K, which breaks the archetypal geometrically frustrated antiferromagnetic state typically ascribed to LuMnO3. The perturbations in the triangular disposition of spins prompt an additional electric polarization contribution and a clear enhancement of the magnetoelectric coupling which are in good agreement with the results of first principles calculations. In addition, Raman spectroscopy, dielectric permittivity, pyroelectric current and magnetic measurements as a function of temperature point out the precursor effects of the magnetic phase transitions involving a strong coupling between spins, lattice and electric order, even above the Néel temperature.

Graphical abstract: Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1−xO3

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Article information


Submitted
09 Nov 2016
Accepted
29 Nov 2016
First published
29 Nov 2016

Phys. Chem. Chem. Phys., 2017,19, 1335-1341
Article type
Paper

Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1−xO3

F. G. Figueiras, D. Karpinsky, P. B. Tavares, J. N. Gonçalves, S. Yañez-Vilar, A. F. Moreira Dos Santos, A. Franz, M. Tovar, J. Agostinho Moreira and V. S. Amaral, Phys. Chem. Chem. Phys., 2017, 19, 1335
DOI: 10.1039/C6CP07682C

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