Relaxor ferroelectrics have neither long range ferroelectric order nor structural transformation down to the lowest temperatures, and display isotropic optical properties like quadratic electro-optic effect. However, if an anisotropy is forced through an external agent, like electric field or uniaxial strain, a ferroelectric and structural long range order can be induced in these materials. Here, we show that epitaxial strain in relaxor ferroelectric thin films can be employed to induce a linear electro-optic effect, opening the path to new strain-controlled electro-optic materials. Epitaxial thin films with Pb1-3x/2LaxZr0.2Ti0.8O3 (x = 0.22) composition grown by pulsed laser deposition on (001) SrRuO3/SrTiO3 single crystal heterostructures become tetragonal below the susceptibility peak, which occurs at a temperature 140 K higher as compared to bulk. These films show piezoelectric properties and almost linear electro-optic behaviour.
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21 August 2014
Research Article|
August 18 2014
Strain-induced long range ferroelectric order and linear electro-optic effect in epitaxial relaxor thin films
N. D. Scarisoreanu;
N. D. Scarisoreanu
a)
1
National Institute for Laser
, Plasma and Radiation Physics, 077125 Magurele, Romania
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F. Craciun;
F. Craciun
2
CNR-ISC
, Istituto dei Sistemi Complessi, Area della Ricerca di Roma-Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy
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R. Birjega;
R. Birjega
1
National Institute for Laser
, Plasma and Radiation Physics, 077125 Magurele, Romania
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A. Andrei;
A. Andrei
1
National Institute for Laser
, Plasma and Radiation Physics, 077125 Magurele, Romania
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V. Ion;
V. Ion
1
National Institute for Laser
, Plasma and Radiation Physics, 077125 Magurele, Romania
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R. F. Negrea;
R. F. Negrea
3
National Institute of Materials Physics
, 077125 Magurele, Romania
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C. Ghica;
C. Ghica
3
National Institute of Materials Physics
, 077125 Magurele, Romania
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M. Dinescu
M. Dinescu
1
National Institute for Laser
, Plasma and Radiation Physics, 077125 Magurele, Romania
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a)
Author to whom correspondence should be addressed. E-mail address: [email protected]
J. Appl. Phys. 116, 074106 (2014)
Article history
Received:
June 11 2014
Accepted:
August 05 2014
Citation
N. D. Scarisoreanu, F. Craciun, R. Birjega, A. Andrei, V. Ion, R. F. Negrea, C. Ghica, M. Dinescu; Strain-induced long range ferroelectric order and linear electro-optic effect in epitaxial relaxor thin films. J. Appl. Phys. 21 August 2014; 116 (7): 074106. https://doi.org/10.1063/1.4893364
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