Polar properties and phase sequence in Eu0.8Y0.2MnO3

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Agostinho A Moreira (Autor) FCUP; Almeida, A (Autor) FCUP; Ferreira, WS (Autor) Outra; Chaves, MR (Autor) Outra; Araujo, JP (Autor) FCUP; Pereira, AM (Autor) FCUP; Vilela, SMF (Autor) Outra; Tavares, PB (Autor) Outra

Revista

Título: Journal of Physics Condensed Matter

Vol. 22

Página Final: 125901

ISSN: 0953-8984

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-003-86N

DOI: 10.1088/0953-8984/22/12/125901

Abstract (EN): In this work, we have studied in detail the temperature dependence of the electric polarization of Eu0.8Y0.2MnO3 aimed at clarifying the controversial issues concerning the ferroelectric nature of the lower temperature magnetic phases and hence its multiferroic character. The existence of a spontaneous polarization in 30 K < T < 22 K, provides clear evidence for the ferroelectric character of the re-entrant non-collinear spiral-antiferromagnetic phase, stable in that temperature range. Contrary to results published in previous works, our experimental data clearly show that the weak-ferromagnetic, canted antiferromagnetic phase stable below 20 K is not intrinsically ferroelectric. The misinterpretation, regarding the polar character of the lower temperature magnetic phases, stems from the existence of an induced polarization occurring below 30 K. The mechanisms associated with polar and magnetic properties, and their correlation with both spin and lattice structures are also discussed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6