Systematic study of terahertz response of SrTiO3 based heterostructures: Influence of strain, temperature, and electric field

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00434411" target="_blank" >RIV/68378271:_____/14:00434411 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.89.214116" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.89.214116</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.89.214116" target="_blank" >10.1103/PhysRevB.89.214116</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Systematic study of terahertz response of SrTiO3 based heterostructures: Influence of strain, temperature, and electric field

Popis výsledku v původním jazyce

Epitaxial heterostructures consisting of a variable number of SrTiO3/DyScO3 bilayers deposited on DyScO3 substrates were investigated using time-domain terahertz spectroscopy down to helium temperatures. The phase transition into a ferroelectric state isobserved in SrTiO3 films in all samples close to 300 K due to in-plane epitaxial strain induced by the substrate and intercalated layers of DyScO3. Evolution of the dielectric spectra with temperature and external electric field is described by a general model which involves a damped harmonic oscillator (soft mode) coupled to a Debye relaxation (central mode). Both modes are connected with the soft mode eigenvector and they reflect a strong anharmonicity of the soft-mode potential. The observed variation of phase transition temperature and of the dielectric response among the structures is ascribed to a partial epitaxial strain relaxation confirmed also by x-ray diffraction.

Název v anglickém jazyce

Systematic study of terahertz response of SrTiO3 based heterostructures: Influence of strain, temperature, and electric field

Popis výsledku anglicky

Epitaxial heterostructures consisting of a variable number of SrTiO3/DyScO3 bilayers deposited on DyScO3 substrates were investigated using time-domain terahertz spectroscopy down to helium temperatures. The phase transition into a ferroelectric state isobserved in SrTiO3 films in all samples close to 300 K due to in-plane epitaxial strain induced by the substrate and intercalated layers of DyScO3. Evolution of the dielectric spectra with temperature and external electric field is described by a general model which involves a damped harmonic oscillator (soft mode) coupled to a Debye relaxation (central mode). Both modes are connected with the soft mode eigenvector and they reflect a strong anharmonicity of the soft-mode potential. The observed variation of phase transition temperature and of the dielectric response among the structures is ascribed to a partial epitaxial strain relaxation confirmed also 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

<a href="/cs/project/GA14-25639S" target="_blank" >GA14-25639S: Ladění terahertzové odezvy dielektrických materiálů a metamateriálových struktur</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

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Svazek periodika

89

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

"214116-1"-"214116-12"

Kód UT WoS článku

000339048100001

EID výsledku v databázi Scopus

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