Local structure of the SnTe topological crystalline insulator: Rhombohedral distortions emerging from the rocksalt phase

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F14%3A39898652" target="_blank" >RIV/00216275:25310/14:39898652 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.90.134101" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.90.134101</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.90.134101" target="_blank" >10.1103/PhysRevB.90.134101</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Local structure of the SnTe topological crystalline insulator: Rhombohedral distortions emerging from the rocksalt phase

Popis výsledku v původním jazyce

A(IV)B(VI) crystals are believed to possess a rhombohedral (ferroelectric) structure at low temperature that changes to the rocksalt (paraelectric) structure above the Curie temperature. For GeTe it has been recently demonstrated that locally the structure retains the subsets of the shorter and longer bonds across the ferroelectric-to-paraelectric transition despite acquiring the cubic structure on average. Nothing is known about the existence of local distortions in SnTe, a prototypical topological crystalline insulator, where the crystal symmetry plays a crucial role. In this work we report the results of x-ray absorption measurements. We find that the structure is locally rhombohedrally distorted, and the distortions increase at T } 100 K, breakingthe rocksalt average symmetry. Our density functional theory simulations performed at 0 K indicate that the role of spin-orbit coupling in the formation of the local structure of SnTe at low temperature is negligibly small. The small stoc

Název v anglickém jazyce

Local structure of the SnTe topological crystalline insulator: Rhombohedral distortions emerging from the rocksalt phase

Popis výsledku anglicky

A(IV)B(VI) crystals are believed to possess a rhombohedral (ferroelectric) structure at low temperature that changes to the rocksalt (paraelectric) structure above the Curie temperature. For GeTe it has been recently demonstrated that locally the structure retains the subsets of the shorter and longer bonds across the ferroelectric-to-paraelectric transition despite acquiring the cubic structure on average. Nothing is known about the existence of local distortions in SnTe, a prototypical topological crystalline insulator, where the crystal symmetry plays a crucial role. In this work we report the results of x-ray absorption measurements. We find that the structure is locally rhombohedrally distorted, and the distortions increase at T } 100 K, breakingthe rocksalt average symmetry. Our density functional theory simulations performed at 0 K indicate that the role of spin-orbit coupling in the formation of the local structure of SnTe at low temperature is negligibly small. The small stoc

Druh

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

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/EE2.3.20.0254" target="_blank" >EE2.3.20.0254: Výzkumný tým pro pokročilé nekrystalické materiály</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

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

—

Svazek periodika

90

Číslo periodika v rámci svazku

13

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

"134101-1"-"134101-6"

Kód UT WoS článku

000344025100001

EID výsledku v databázi Scopus

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