Scaling spin-phonon and spin-spin interactions in magnetoelectric Gd1-xYxMnO3

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Vilarinho, R (Author) Other; Queiros, EC (Author) Other; Almeida, A (Author) FCUP; Tavares, PB (Author) Other; Guennou, M (Author) Other; Kreisel, J (Author) Other; Agostinho Moreira, JA (Author) FCUP

Journal

Title: Journal of Solid State Chemistry

Vol. 228

Pages: 76-81

ISSN: 0022-4596

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 17 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-00G-3JA

DOI: 10.1016/j.jssc.2015.04.028

Abstract (EN): We present a systematic study of the structure and lattice dynamics at room temperature, and the phonon behavior at low temperatures in orthorhombic Gd1-xYxMnO3 manganites, with 0 <= x <= 0.4. Powder x-ray diffraction and Raman scattering at ambient conditions reveal that the Jahn-Teller distortion is composition-independent, while the Mn-O1-Mn bond angle increases by about 0.5 degrees from x=0 to x=0.4. The spin-phonon coupling was ascertained from the relation between the renormalized wavenumber of the in-plane O2 stretching mode, associated with the spin-spin correlation function. The balance between competitive magnetic interactions is discussed based on the temperature dependence of the phonon frequency renormalization.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6