The largest NMR spectrometer you can buy today uses high-temperature superconductors and classical ones, but it still cools everything down with liquid helium.

The largest NMR spectrometer you can buy today uses high-temperature superconductors and classical ones, but it still cools everything down with liquid helium. As far as I understand you can push more current through the high temperature superconductors when you cool them down more. NMR spectrometers work on essentially the same mechanism as MRIs, just in a very different form factor. It might even work for MRIs without helium because they have a much lower field (~3-6T) compared to the ~28T of the highest field NMR spectrometer. The high-temperature superconductors are still pretty new for this field, it took a while to figure out manufacturing them on a scale and quality that could be used for these large magnets.