Title :
Study of Ba1-xSrxTiO3(100) epitaxial thin films prepared by laser deposition
Author :
Wu, N.J. ; Lin, H. ; Xie, K. ; Li, X.Y. ; Jia Li ; Ignatiev, A.
Author_Institution :
Space Vacuum Epitaxy Center, Houston Univ., TX, USA
Abstract :
Heteroepitaxial Ba1-xSrxTiO3 (x=0.4 and x=0.5) thin films of thickness from 20 nm to 500 nm were grown on high Tc superconducting YBa2Cu3O7-x (YBCO) thin film substrates by laser ablation. Perovskite-type BST(100) on c-oriented YBCO/LaAlO3(100) started to form at 500°C and exhibited good crystallinity at 550°C-620°C. The films were characterized in the temperature range of 20 K to 300 K by polarization-versus-electric field (P-E), capacitance-versus-voltage (C-V) and current-versus-voltage (I-V) measurements. Both BST(100) thin films with x=0.4 and x=0.5 showed ferroelectric behavior below room temperature with maximum polarization of 3 μC/cm2 and 1.4 μC/cm2, respectively. Resistivity above 1011 Ohm·cm was obtained in the temperature range from 30 K to 300 K. Interface properties and phase transitions are discussed
Keywords :
barium compounds; electrical resistivity; ferroelectric thin films; ferroelectric transitions; high-temperature superconductors; pulsed laser deposition; strontium compounds; superconducting thin films; yttrium compounds; 1E11 ohmcm; 20 to 300 K; 20 to 500 nm; 500 to 620 degC; BaSrTiO3-YBa2Cu3O7; C-V measurements; I-V measurements; LaAlO3; YBa2Cu3O7; crystallinity; epitaxial thin films; ferroelectric films; high temperature superconductor; laser ablation; laser deposition; phase transitions; polarization; resistivity; thin film substrates; Capacitance; Crystallization; Ferroelectric films; Laser ablation; Polarization; Strontium; Substrates; Superconducting thin films; Temperature distribution; Yttrium barium copper oxide;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522403
