Spin–phonon coupling in multiferroic YbMnO3 studied by Raman scattering

• Published in: Journal of physics. Condensed matter Vol. 21; no. 6; pp. 064218 - 064218 (5)
• Main Authors: Fukumura, H, Hasuike, N, Harima, H, Kisoda, K, Fukae, K, Yoshimura, T, Fujimura, N
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Bristol IOP Publishing 11.02.2009; Institute of Physics
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Infrared and raman spectra and scattering; Lattice dynamics; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other nonmetallic inorganics; Phonon-quasiparticle interactions; Phonons and vibrations in crystal lattices; Physics; Ferroic material; Hexagonal lattices; Raman spectra; Temperature effects; Ytterbium Manganites; Phonon mode; Polycrystals; Spin-phonon interactions
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/21/6/064218

Hexagonal YbMnO3 bulk polycrystals were prepared and studied by Raman scattering in the temperature range of 15-300 K. A total of 15 phonon modes of A1, E1 and E2 type were identified. Some E2 phonon modes showed anomalous temperature variations in frequency at TN~80 K, suggesting a coupling between the spin and phonon systems below TN. As another evidence of spin-phonon coupling, softening of an A1-phonon mode for the O-Mn vibration was observed at ~TN. Substitution of Mn by Al suggests this view.