Suppression of the cooperative Jahn-Teller distortion and its effect on the Raman octahedra-rotation modes of TbMn1-&ITx&ITFe&ITx&ITO3

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Vilarinho, R (Author) Other; Passos, DJ (Author) Other; Queiros, EC (Author) Other; Tavares, PB (Author) Other; Almeida, A (Author) Other; Weber, MC (Author) Other; Guennou, M (Author) Other; Kreise, J (Author) Other; Agostinho Moreira, JA (Author) FCUP

Journal

Title: Physical Review B

Vol. 97

ISSN: 2469-9950

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-00N-X9F

DOI: 10.1103/physrevb.97.144110

Abstract (EN): This work reports the changes in structure and lattice dynamics induced by substituting the Jahn-Teller-active Mn-3(+) ion by the Jahn-Teller-inactive Fe3+ in TbMn1-xFexO3 over the full composition range. The structural analysis reveals that the amplitude of the cooperative Jahn-Teller distortion decreases linearly from x = 0 (pure TbMnO3) to x = 0.5, where it is completely suppressed. We then correlate this evolution with the behavior of the Raman modes across the solid solution. In particular, we show that the Raman modes associated with the rotation of octahedra, whose wave number is commonly considered to scale linearly with the tilt angles in orthorhombic Pnma perovskites, are also sensitive to the amplitude of the Jahn-Teller distortion.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7