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Description
| - Germanium telluride is a material presenting both spontaneous polarization and electrical conductivity; the mechanism of its ferroelectric phase transition is still not well understood. 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 C 1 105 K.
- Germanium telluride is a material presenting both spontaneous polarization and electrical conductivity; the mechanism of its ferroelectric phase transition is still not well understood. 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 C 1 105 K. (en)
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Title
| - Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy
- Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy (en)
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skos:prefLabel
| - Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy
- Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy (en)
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skos:notation
| - RIV/68378271:_____/11:00373848!RIV12-AV0-68378271
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http://linked.open...avai/predkladatel
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - P(GC202/09/J045), Z(AV0Z10100520)
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/68378271:_____/11:00373848
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - terahertz spectroscopy; phase transition; semiconductor (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Kužel, Petr
- Petzelt, Jan
- Kadlec, Christelle
- Kadlec, Filip
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http://linked.open...ain/vavai/riv/wos
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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http://bibframe.org/vocab/doi
| - 10.1103/PhysRevB.84.205209
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is http://linked.open...avai/riv/vysledek
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