Lattice dynamics of Sb2Te3 at high pressures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F11%3A39895555" target="_blank" >RIV/00216275:25310/11:39895555 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.84.174305" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.84.174305</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.84.174305" target="_blank" >10.1103/PhysRevB.84.174305</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lattice dynamics of Sb2Te3 at high pressures

Popis výsledku v původním jazyce

We report an experimental and theoretical lattice dynamics study of antimony telluride (Sb2Te3) up to 26 GPa together with a theoretical study of its structural stability under pressure. Raman-active modes of the low-pressure rhombohedral (R-3m) phase were observed up to 7.7 GPa. Changes of the frequencies and linewidths were observed around 3.5 GPa where an electronic topological transition was previously found. Raman-mode changes evidence phase transitions at 7.7, 14.5, and 25 GPa. The frequencies andpressure coefficients of the new phases above 7.7 and 14.5 GPa agree with those calculated for the monoclinic C2/m and C2/c structures recently observed at high pressures in Bi2Te3 and also for the C2/m phase in the case of Bi2Se3 and Sb2Te3. Above 25 GPa no Raman-active modes are observed in Sb2Te3, similarly to the case of Bi2Te3 and Bi2Se3. Therefore, it is possible that the structure of Sb2Te3 above 25 GPa is the same disordered bcc phase already found in Bi2Te3 by x-ray diffraction

Název v anglickém jazyce

Lattice dynamics of Sb2Te3 at high pressures

Popis výsledku anglicky

We report an experimental and theoretical lattice dynamics study of antimony telluride (Sb2Te3) up to 26 GPa together with a theoretical study of its structural stability under pressure. Raman-active modes of the low-pressure rhombohedral (R-3m) phase were observed up to 7.7 GPa. Changes of the frequencies and linewidths were observed around 3.5 GPa where an electronic topological transition was previously found. Raman-mode changes evidence phase transitions at 7.7, 14.5, and 25 GPa. The frequencies andpressure coefficients of the new phases above 7.7 and 14.5 GPa agree with those calculated for the monoclinic C2/m and C2/c structures recently observed at high pressures in Bi2Te3 and also for the C2/m phase in the case of Bi2Se3 and Sb2Te3. Above 25 GPa no Raman-active modes are observed in Sb2Te3, similarly to the case of Bi2Te3 and Bi2Se3. Therefore, it is possible that the structure of Sb2Te3 above 25 GPa is the same disordered bcc phase already found in Bi2Te3 by x-ray diffraction

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

1098-0121

e-ISSN

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Svazek periodika

84

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

"174305-1"-"174305-12"

Kód UT WoS článku

000297413700002

EID výsledku v databázi Scopus

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