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Title: Finite-size effects in lead scandium tantalate relaxor thin films

Abstract

© 2020 American Physical Society. Large electromechanical effects in relaxor ferroelectrics are generally attributed to the collective response of an ensemble of correlated, nanometer-sized polar structures induced by chemical and charge disorder. Here, we study finite-size effects on such polar order (i.e., how it evolves when sample dimensions approach the polarization correlation length) in 7-70-nm-thick films of the relaxor ferroelectric PbSc0.5Ta0.5O3. Temperature-dependent polarization studies reveal a linear suppression of the polarization and nonlinearity associated with relaxor order as the film thickness decreases to ≈30 nm. Below this thickness, however, the suppression rapidly accelerates, and polarization is completely absent by film thicknesses of ≈7 nm, despite the continued observation of a broad peak in dielectric permittivity and frequency dispersion. Diffuse-scattering measurements reveal the diffuse-scattering symmetry, and analysis suggests the films have a polarization correlation length of ≈23 nm. Taken together, it is apparent that reduction of sample size and the resulting distribution of polar structures drive suppression and eventual quenching of the electrical response of relaxors, which may be attributed to increasing dipole-dipole and dipole-interface interactions.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1619165
Alternate Identifier(s):
OSTI ID: 1603202
Grant/Contract Number:  
AC02-05CH11231; AC02-05-CH11231; SC-0012375
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 9
Country of Publication:
United States
Language:
English

Citation Formats

Fernandez, A, Kim, J, Meyers, D, Saremi, S, and Martin, LW. Finite-size effects in lead scandium tantalate relaxor thin films. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.094102.
Fernandez, A, Kim, J, Meyers, D, Saremi, S, & Martin, LW. Finite-size effects in lead scandium tantalate relaxor thin films. United States. doi:10.1103/PhysRevB.101.094102.
Fernandez, A, Kim, J, Meyers, D, Saremi, S, and Martin, LW. Sun . "Finite-size effects in lead scandium tantalate relaxor thin films". United States. doi:10.1103/PhysRevB.101.094102.
@article{osti_1619165,
title = {Finite-size effects in lead scandium tantalate relaxor thin films},
author = {Fernandez, A and Kim, J and Meyers, D and Saremi, S and Martin, LW},
abstractNote = {© 2020 American Physical Society. Large electromechanical effects in relaxor ferroelectrics are generally attributed to the collective response of an ensemble of correlated, nanometer-sized polar structures induced by chemical and charge disorder. Here, we study finite-size effects on such polar order (i.e., how it evolves when sample dimensions approach the polarization correlation length) in 7-70-nm-thick films of the relaxor ferroelectric PbSc0.5Ta0.5O3. Temperature-dependent polarization studies reveal a linear suppression of the polarization and nonlinearity associated with relaxor order as the film thickness decreases to ≈30 nm. Below this thickness, however, the suppression rapidly accelerates, and polarization is completely absent by film thicknesses of ≈7 nm, despite the continued observation of a broad peak in dielectric permittivity and frequency dispersion. Diffuse-scattering measurements reveal the diffuse-scattering symmetry, and analysis suggests the films have a polarization correlation length of ≈23 nm. Taken together, it is apparent that reduction of sample size and the resulting distribution of polar structures drive suppression and eventual quenching of the electrical response of relaxors, which may be attributed to increasing dipole-dipole and dipole-interface interactions.},
doi = {10.1103/PhysRevB.101.094102},
journal = {Physical Review B},
number = 9,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}

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