Phonon Characteristics of Polycrystalline Cubic SrTiO3 Thin Films
DU Yu-Le1, CHEN Guang1, ZHANG Ming-Sheng2, YANG Sen-Zu3
1Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094
2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
3Department of Electrical Science and Engineering, Nanjing University, Nanjing 210093
Phonon Characteristics of Polycrystalline Cubic SrTiO3 Thin Films
DU Yu-Le1;CHEN Guang1;ZHANG Ming-Sheng2;YANG Sen-Zu3
1Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094
2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093
3Department of Electrical Science and Engineering, Nanjing University, Nanjing 210093
Abstract：Polycrystalline SrTiO3 thin films with the cubic perovskite structure were grown on quartz substrates by pulsed laser deposition. The first-order Raman scattering processes, which were forbidden in SrTiO3 single crystals, were observed in the films at 300 K and lower temperatures due to the structural distortion causing by strain effect and oxygen vacancies. The polar TO2 phonon showed a typical Fano asymmetry in the entire temperature region from 95 K to 300 K. In contrast, the nonpolar TO3 phonon and polar TO4 phonons were mostly symmetric.
2003, Vol. 20 
