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

0463498 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA13-15110S
Institucionální podpora: RVO:68378271
Klíčová slova: augmented-wave method * crystals * phase
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.836, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0263272