Ferroelectricity in ultra-thin and thick ferroelectric films of~Pb$_{0.35}$Sr$_{0.65}$TiO$_{3}$ studied by second~harmonic generation

ORAL

Abstract

Second harmonic generation (SHG) measurements were performed in the reflection geometry using the femtosecond Ti:Sapphire pulse laser at the wavelength of 810 nm for a 16-nm-thick ultra-thin Pb$_{0.35}$Sr$_{0.65}$TiO$_{3}$ film and a 243-nm-thick Pb$_{0.35}$Sr$_{0.65}$TiO$_{3}$ film, which were epitaxially deposited on (001) MgO substrates by pulsed laser ablation (PLD). It is concluded that in the ultra-thin film the ferroelectric phase is still present and a remarkably sharp ferroelectric phase transition was observed. In contrast, the thick film exhibits a pronounced diffuse phase transition. Theoretical analysis based on the polarization diagrams show the compensated c-domain fraction is dominant in both films whereas the nonlinear susceptibility of the ultra-thin film has a different tensor property from the thick film.

*The authors acknowledge the funding support from the grant through the Army Research Laboratory (Award No. DAAD19-03-2-0017)

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Authors

  • Shiwei Liu

    • Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701

  • Jak Chakhalian

    • Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701
    • University of Arkansas
    • Univ. of Arkansas

  • Min Xiao

    • Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701

  • Chonglin Chen

    • Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249