Pressure-induced structural and electronic phase transitions in GaGeTe

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F24%3A00582995" target="_blank" >RIV/61388955:_____/24:00582995 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.054107" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.054107</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.109.054107" target="_blank" >10.1103/PhysRevB.109.054107</a>

Result language
angličtina
Original language name
Pressure-induced structural and electronic phase transitions in GaGeTe
Original language description
Chalcogenide-based compounds are an important part of the family of layered materials, extensively studied for their two-dimensional properties. An interesting line of investigation relates to the evolution of their properties with hydrostatic pressure, which could lead to structural transitions and itinerant electronic behavior. Here, we investigate the evolution of a layered ternary compound GaGeTe as a function of pressure with x-ray diffraction, Raman and infrared spectroscopy, and ab initio calculations. The Ge layer retains a germanenelike vibration though enveloped in Ga and Te layers. We show experimental and theoretical evidence of metallization in two steps. At ∼6 GPa Raman and infrared spectroscopic data undergo changes compatible with delocalized charge carriers. Calculations ascribe this to the Fermi-level crossing of a valence band. At ∼16 GPa infrared transmission and Raman modes disappear and x-ray diffraction signals a structural transition to a phase which is metallic according to our calculations. We obtain consistent agreement between experiment and theory concerning the structural, vibrational, and electronic structure evolution with pressure.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/GX20-08633X" target="_blank" >GX20-08633X: ÅrchitectRonics of Two-dimensional crystals via synergy of chiral electro-chemical and opto-electronic concepts on Å-scale</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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