Systematic study of terahertz response of SrTiO3 based heterostructures: Influence of strain, temperature, and electric field
Result description
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.
Keywords
dielectric responseterahertz spectroscopyferroelectricsthin filmsphase transition
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Systematic study of terahertz response of SrTiO3 based heterostructures: Influence of strain, temperature, and electric field
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
—
Result continuities
Project
GA14-25639S: Tuning of terahertz response of dielectric materials and metamaterial structures
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2014
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
—
Volume of the periodical
89
Issue of the periodical within the volume
21
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
"214116-1"-"214116-12"
UT code for WoS article
000339048100001
EID of the result in the Scopus database
—
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BM - Solid-state physics and magnetism
Year of implementation
2014