V. Talyansky et al., MODIFIED DEPOSITION PROCEDURE FOR HIGH-QUALITY YBA2CU3O7-X SRTIO3 BILAYERS/, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 2869-2871
The degradation of an ultrathin YBCO layer under SrTiO3 due to oxygen
deficiency poses a fundamental problem in growing a bilayer which may
be patterned into a superconducting FET. Annealing between depositions
while growing the bilayer can help increase the T-c of the YBCO while
retaining acceptable quality of the SrTiO3. This study found T-c in t
he range of 60-80 K for a 4 unit-cell thick YBCO film under SrTiO3.