Order-disorder behavior in betaine arsenate studied by Raman scattering

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Yuzyuk, YI (Author) Other; Moreira, JA (Author) Other; Almeida, A (Author) FCUP; Chaves, MR (Author) FCUP; Pinto, F (Author) Other; Klopperpieper, A (Author) Other

Journal

Title: Physical Review B - Condensed Matter and Materials Physics

Vol. 61

Pages: 15035-15041

ISSN: 1098-0121

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-ZZV

DOI: 10.1103/physrevb.61.15035

Abstract (EN): A detailed study of Raman polarized spectra in betaine arsenate (BA) is presented. The results obtained give a significant contribution to the clarification of some controversial aspects of the critical behavior in BA. The temperature evolution of the hydrogen bonds stretching modes shows that different types of hydrogen bonds present different kinds of critical behavior. It also provides evidence of a proton ordering in the shorter hydrogen bond, i.e., along the c direction, at the para-ferroelectric phase transition. An order-disorder mechanism in the low-temperature region manifests itself by the progressive softening of the dynamical central peak observed in the tow-frequency spectra. Futhermore, a hint of a short-range ordering below 150 K was found which is related to the existence of polar clusters even in the paraelectric phase.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7