Polar Dynamics at the Jahn-Teller Transition in Ferroelectric Ga V4 S8

Zhe Wang, E. Ruff, M. Schmidt, V. Tsurkan, I. Kézsmárki, P. Lunkenheimer, A. Loidl

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Abstract

We present a dielectric spectroscopy study of the polar dynamics linked to the orbitally driven ferroelectric transition in the Skyrmion host GaV4S8. By combining THz and MHz-GHz spectroscopy techniques, we succeed in detecting the relaxational dynamics arising from coupled orbital and polar fluctuations in this material and trace its temperature dependence in the paraelectric as well as in the ferroelectric phase. The relaxation time significantly increases when approaching the critical temperature from both sides of the transition. It is natural to assume that these polar fluctuations map the orbital dynamics at the Jahn-Teller transition. Because of the first-order character of the orbital-ordering transition, the relaxation time shows an enormous jump of about 5 orders of magnitude at the polar and structural phase transition.

Original languageEnglish
Article number207601
JournalPhysical review letters
Volume115
Issue number20
DOIs
Publication statusPublished - Nov 10 2015

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Wang, Z., Ruff, E., Schmidt, M., Tsurkan, V., Kézsmárki, I., Lunkenheimer, P., & Loidl, A. (2015). Polar Dynamics at the Jahn-Teller Transition in Ferroelectric Ga V4 S8. Physical review letters, 115(20), [207601]. https://doi.org/10.1103/PhysRevLett.115.207601