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; V. S. Amaral

doi:10.1039/c6cp07682c

Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn_{1-: X}O₃

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, V. S. Amaral

Materials Engineering

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13 Scopus citations

Abstract

This study provides a comprehensive insight into the effects of controlled off-stoichiometry on the structural and multiferroic properties of the hexagonal manganite LuMn_1-xO_3+δ (x = 0.02; δ ∼ 0), supported by neutron powder diffraction measurements confirming single phase P6₃cm symmetry and evidencing a relevant ferromagnetic component, below T_N ∼ 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.

Original language	English
Pages (from-to)	1335-1341
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	19
Issue number	2
DOIs	https://doi.org/10.1039/c6cp07682c
State	Published - 2017

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title = "Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1-: XO3",

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 N{\'e}el temperature.",

author = "Figueiras, {F. G.} and D. Karpinsky and Tavares, {P. B.} and Gon{\c c}alves, {J. N.} and S. Ya{\~n}ez-Vilar and {Moreira Dos Santos}, {A. F.} and A. Franz and M. Tovar and {Agostinho Moreira}, J. and Amaral, {V. S.}",

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year = "2017",

doi = "10.1039/c6cp07682c",

language = "English",

volume = "19",

pages = "1335--1341",

journal = "Physical Chemistry Chemical Physics",

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T1 - Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1-: XO3

AU - Figueiras, F. G.

AU - Karpinsky, D.

AU - Tavares, P. B.

AU - Gonçalves, J. N.

AU - Yañez-Vilar, S.

AU - Moreira Dos Santos, A. F.

AU - Franz, A.

AU - Tovar, M.

AU - Agostinho Moreira, J.

AU - Amaral, V. S.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

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VL - 19

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EP - 1341

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 2

ER -

Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn_{1-: X}O₃

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