An artificial cuprate compound belonging to the BiSrCaCuO family with
eight adjacent CuO2 layers in each building block was deposited on a s
ingle crystal of SrTiO3 by sequentially imposed layer epitaxy. This co
mpound undergoes a five order of magnitude resistivity drop with an on
set near 280 kelvin and an offset at 250 kelvin. It exhibits a diamagn
etic variation of susceptibility and magnetization below 290 kelvin. A
dditional observed features, such as strongly nonlinear conductivity,
suggests superconductivity as a plausible explanation of the propertie
s of this compound.