%0 Journal Article
%K Deposition
%K Superconducting films
%K Substrates
%K Polarization
%K Epitaxial growth
%K Ferroelectricity
%K High temperature superconductors
%K Heterojunctions
%K Interfaces (materials)
%K Electric field effects
%K X-ray diffraction analysis
%K Superconducting transition temperature
%K Critical currents
%K Ferroelectric field effects
%A Z.W Dong
%A Z Trajanovic
%A T Boettcher
%A I Takeuchi
%A V Talyansky
%A C.-H Chen
%A R.P Sharma
%A Ramamoorthy Ramesh
%A T Venkatesan
%B IEEE Transactions on Applied Superconductivity
%D 1997
%G eng
%P 3516-3519
%T Studies of ferroelectric field effects in Pt/Pb(Zr0. 5Ti0. 5)O3/YBa2Cu3O7 heterostructures
%V 7
%X Pt/Pb(Zr0. 5Ti0. 5)O3/YBa2Cu3O7 (Pt/PZT/YBCO) heterostructures were made by pulsed laser deposition on (lOO)SrTiOj or (100) LaSrGaO4 substrates for studies of ferroelectric field effects in high-Tc superconducting thin films. X-ray diffraction data including <t> scans indicated that the PZT layer grew with c-axis orientation epitaxially on top of the YBCO layers. Polarization measurements at room temperature and 77 K showed similar hysteretic loops in the PZT layer. The rémanent polarization field can induce as many as 10 carriers/cm in the bottom superconducting channel at the interface. Both c-axis and in-plane-aligned a-axis-oriented YBCO films typically exhibiting zero resistance transition temperature of   85 K were used as superconducting channels. By polarizing the PZT film a 2 - 5% change in both the channel resistance and the critical current at 77 - 85 K was obtained in 100 nm thick films. Device operation at microsecond speeds was observed. © 1997 IEEE.