Note that they're talking about a technique that _may_ be applicable to high temperature superconductors. The actual result here is a distinguishable phase cha

Note that they're talking about a technique that _may_ be applicable to high temperature superconductors. The actual result here is a distinguishable phase change due to pressure being maintained after the release of that pressure, causing the material to be a superconductor below 40K, instead of the 9K that material would otherwise require.