Title :
LaAlO3-YBCO multilayers
Author :
Lee, A.E. ; Burch, J.F. ; Simon, R.W. ; Luine, J.A. ; Hu, R. ; Schwarzbek, S.M.
Author_Institution :
TRW Space & Technol. Group, Redondo Beach, CA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
The authors describe the growth of HTS (high-temperature superconductor) bilayers (LaAlO3/YBa2Cu3O7) and trilayers (YBa2Cu3O7/LaAlO3/YBa2 Cu3O7) using off-axis RF sputtering from single stoichiometric targets. TEM (transmission electron microscope) examination shows that both the LaAlO3 and YBa2Cu 3O7 films grow epitaxially upon the preceding layer. The interfaces between layers and at the LaAlO3 substrates are sharp and clean. It is found that deposition of the subsequent layers does not degrade the electrical properties of the bottom YBa2Cu3O7 layer; this observation extends to the surface resistance and to the superconducting transition temperature of the bottom YBCO layer. The results of the electrical measurements of the multilayer structures made by the off- and on-axis LaAlO3 depositions are discussed
Keywords :
barium compounds; high-temperature superconductors; lanthanum compounds; superconducting thin films; superconducting transition temperature; transmission electron microscope examination of materials; yttrium compounds; LaAlO3; LaAlO3-YBa2Cu3O7; RF sputtering; YBa2Cu3O7-LaAlO3-YBa 2Cu3O7; bilayers; electrical properties; high-temperature superconductor; multilayer structures; stoichiometric targets; superconducting transition temperature; surface resistance; transmission electron microscope; trilayers; Degradation; Electric resistance; High temperature superconductors; Radio frequency; Sputtering; Substrates; Superconducting transition temperature; Surface cleaning; Surface resistance; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
