Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

Sri Gyan, Deepankar; Lee, Hyeon Jun; Ahn, Youngjun; Carson, River B.; Carnis, Jerome; Kim, Tae Yeon; Unithrattil, Sanjith; Lee, Jun Young; Chun, Sae Hwan; Kim, Sunam; Eom, Intae; Kim, Minseok; Park, Sang‐Youn; Kim, Kyung Sook; Lee, Ho Nyung; Jo, Ji Young; Evans, Paul G.

doi:10.1002/aelm.202101051

Title: Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

Journal Article · 27 December 2021 · Advanced Electronic Materials

DOI: https://doi.org/10.1002/aelm.202101051 · OSTI ID:1854452

^[1];

^[1]; Ahn, Youngjun ^[1]; Carson, River B. ^[1]; Carnis, Jerome ^[2]; Kim, Tae Yeon ^[3]; Unithrattil, Sanjith ^[3]; Lee, Jun Young ^[3]; Chun, Sae Hwan ^[4]; Kim, Sunam ^[4]; Eom, Intae ^[4]; Kim, Minseok ^[4]; Park, Sang‐Youn ^[4]; Kim, Kyung Sook ^[4];

^[5]; Jo, Ji Young ^[3];

^[1]

Univ. of Wisconsin, Madison, WI (United States)
Aix-Marseille Univ., Marseille (France)
Gwangju Inst. of Science and Technology (Korea, Republic of)
Pohang Accelerator Lab. (PAL) (Korea, Republic of)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Above-bandgap femtosecond optical excitation of a ferroelectric/dielectric BaTiO₃/CaTiO₃ superlattice leads to structural responses that are a consequence of the screening of the strong electrostatic coupling between the component layers. Time-resolved X-ray free-electron laser diffraction shows that the structural response to optical excitation includes a net lattice expansion of the superlattice consistent with depolarization-field screening driven by the photoexcited charge carriers. The depolarization-field-screening-driven expansion is separate from a photoacoustic pulse launched from the bottom electrode on which the superlattice is epitaxially grown. The distribution of diffracted intensity of superlattice X-ray reflections indicates that the depolarization-field-screening-induced strain includes a photoinduced expansion in the ferroelectric BaTiO₃ and a contraction in CaTiO₃. The magnitude of expansion in BaTiO₃ layers is larger than the contraction in CaTiO₃. The difference in the magnitude of depolarization-field-screening-driven strain in the BaTiO₃ and CaTiO₃ components can arise from the contribution of the oxygen octahedral rotation patterns at the BaTiO₃/CaTiO₃ interfaces to the polarization of CaTiO₃. The depolarization-field-screening-driven polarization reduction in the CaTiO₃ layers points to a new direction for the manipulation of polarization in the component layers of a strongly coupled ferroelectric/dielectric superlattice.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Research Foundation of Korea; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-04ER46147

OSTI ID:: 1854452

Journal Information:: Advanced Electronic Materials, Journal Name: Advanced Electronic Materials Journal Issue: 6 Vol. 8; ISSN 2199-160X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Ferroelectric/dielectric superlattice
depolarization-field screening
ultrafast structural phenomena
x-ray free-electron laser diffraction

Title: Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice

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