The unit cell apparently has: 1 Copper atom 25 oxygen atoms 6 Phosphorous atoms 9 lead atoms There are many ways to arrange these constituents. It’s hard to

The unit cell apparently has: 1 Copper atom 25 oxygen atoms 6 Phosphorous atoms 9 lead atoms There are many ways to arrange these constituents. It’s hard to create the environment where they want to go exactly where you hope over a large volume. Sometimes this level of precision requires atomic control of layer growth and extreme temperature management. That’s why the methods list days between steps to get the atoms diffusing, and that’s for a few micrograms of material.