Lattice modes and the Jahn-Teller ferroelectric transition of GaV.sub.4./sub.S.sub.8./sub.

0463498 - FZÚ 2017 RIV US eng J - Journal Article
Hlinka, Jiří - Borodavka, Fedir - Rafalovskyi, Iegor - Dočekalová, Zuzana - Pokorný, Jan - Gregora, Ivan - Tsurkan, V. - Nakamura, H. - Mayr, F. - Kuntscher, C.A. - Loidl, A. - Bordács, S. - Szaller, D. - Lee, H.-J. - Lee, J.H. - Kézsmárki, I.
Lattice modes and the Jahn-Teller ferroelectric transition of GaV₄S₈.
Physical Review B. Roč. 94, č. 6 (2016), 1-4, č. článku 060104. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR GA13-15110S
Institutional support: RVO:68378271
Keywords : augmented-wave method * crystals * phase
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.836, year: 2016

Crystal of GaV4S8, a multiferroic system hosting a Néel-type skyrmion lattice phase, has been investigated by polarized Raman and IR spectroscopy above and below the ferroelectric phase transition. Counts of the observed IR and Raman-active modes belonging to distinct irreducible representations agree quite well with group-theory predictions. Phonon spectra are assigned and interpreted with the aid of ab initio calculations of the phonon spectra in the ferroelectric phase. Results allow appreciation of phonon frequencies of the modes involved in Jahn-Teller distortion and their contribution to the spontaneous polarization.
Permanent Link: http://hdl.handle.net/11104/0263272