The fabrication and measurement of microbridge junctions in the vertic
al c-axis direction of YBCO/PBCO/YBCO evaporated thin films is describ
ed, Single junctions show critical current modulation with applied mag
netic field, the period scaling with junction size, The IV characteris
tics show Shapiro steps to high order when irradiated with microwaves.
Initial measurements of linear arrays suggest that with further optim
isation of the processing steps a reproducible junction technology cou
ld emerge. Very low inductance (L approximate to 5-15pH) SQUIDs have b
een demonstrated with dV/d Phi>1mV/Phi(0) at 50K, The vertical SQUID l
oop geometry of these SQUIDs has allowed a direct determination of the
penetration depth as a function of temperature.