Polar Dynamics at the Jahn-Teller Transition in Ferroelectric GaV4S8

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 traced 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. Due to the first-order character of the orbital-ordering transition, the relaxation time shows an enormous jump of about five orders of magnitude at the polar and structural phase transition.

5 pages, 4 figures

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• Spin-phonon coupling in ZnCr2Se4
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• Infrared nanoscopy down to liquid helium temperatures
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• Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic GeV4S8
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• Terahertz Dielectric Analysis and Spin-Phonon Coupling in Multiferroic GeV${}_4$S${}_8$
• Excitations and relaxation dynamics in multiferroic GeV4S8 studied by THz and dielectric spectroscopy
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• Bond Ordering and Molecular Spin-Orbital Fluctuations in the Cluster Mott Insulator GaTa${}_4$Se${}_8$
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