our compound shows greatly consistent x-ray diffraction spectrum with the previously reported structure data
Uhh, doesn’t look like it to me. This paper’s X-ray diffraction spectrum looks pretty noisy compared to the one from the original paper, with some clear additional/different peaks in certain regions. That could potentially affect the result. I was under the impression from the original paper that a subtle compression of the lattice structure was pretty important to formation of quantum wells for superconductivity, so if the X-ray diff isn’t spot on I’ll wait for some more failures before calling it busted.
Got a source? When I first read about this people were cautiously optimistic partly because the head researcher was well-respected.