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• W2330573990 abstract "Germanium telluride (GeTe) is a ferroelectric material presenting, at room temperature, both spontaneous polarization and electrical conductivity. Despite the simplicity of its crystal structure, the mechanism of the phase transition is still not well understood; the free charge carriers prevent the use of traditional spectroscopic techniques which could provide detailed information. While, for a long time, the transition was believed to be of displacive character, recent evidence suggests an order-disorder type. We report results of high-temperature measurements of GeTe thin films by means of terahertz spectroscopy showing the absence of critical phonon softening and revealing a low-frequency excitation in the paraelectric phase. We suggest two possible mechanisms which could be at the origin of this feature: either a critical relaxation related to the phase transition or hopping of free charge carriers. The former mechanism appears more probable due to the observed temperature evolution of the spectra. This indicates a mixed character of the phase transition; assuming a Curie-Weiss behavior, we deduce the value of the Curie-Weiss constant as $Censuremath{approx}1ifmmodetimeselsetexttimesfi{}{10}^{5}phantom{rule{0.28em}{0ex}}text{K}$." @default.
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• W2330573990 date "2011-11-14" @default.
• W2330573990 modified "2023-10-01" @default.
• W2330573990 title "Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy" @default.
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• W2330573990 doi "https://doi.org/10.1103/physrevb.84.205209" @default.
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