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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Figueiras, FG (Autor) FCUP; Karpinsky, D (Autor) Outra; Tavares, PB (Autor) Outra; Goncalves, JN (Autor) Outra; Yanez Vilar, S (Autor) Outra; Moreira Dos Santos, AFM (Autor) Outra; Franz, A (Autor) Outra; Tovar, M (Autor) Outra; Agostinho Moreira, JA (Autor) FCUP; Amaral, VS (Autor) Outra

Revista

Título: Physical Chemistry Chemical Physics

Vol. 19 Nº 2

Páginas: 1335-1341

ISSN: 1463-9076

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: P-00M-ED8

DOI: 10.1039/c6cp07682c

Abstract (EN): 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+delta (x = 0.02; delta similar to 0), supported by neutron powder diffraction measurements confirming single phase P6(3)cm symmetry and evidencing a relevant ferromagnetic component, below T-N similar to 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 Neel temperature.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7