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

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Agostinho Moreira, JA (Author) FCUP; Almeida, A (Author) FCUP; Ferreira, WS (Author) Other; Chaves, MR (Author) Other; araujo, j. p. (Author) FCUP; pereira, a. m. (Author) FCUP; Vilela, SMF (Author) Other; Tavares, PB (Author) Other

Journal

Title: Journal of Physics Condensed Matter

Vol. 22

Final page: 125901

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 8 Citations

ISI Web of Science

Scopus - 8 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6