Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F11%3A00373848" target="_blank" >RIV/68378271:_____/11:00373848 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.84.205209" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.84.205209</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.84.205209" target="_blank" >10.1103/PhysRevB.84.205209</a>
Alternative languages
Result language
angličtina
Original language name
Study of the ferroelectric phase transition in germanium telluride using time-domain terahertz spectroscopy
Original language 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 ?lms 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.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GC202%2F09%2FJ045" target="_blank" >GC202/09/J045: Electronic transport in phase-change materials</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review. B
ISSN
1098-0121
e-ISSN
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Volume of the periodical
84
Issue of the periodical within the volume
20
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
"205209/1"-"205209/8"
UT code for WoS article
000297104700011
EID of the result in the Scopus database
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