Although this is a high-temperature superconductor in the literal sense, it isn't the kind of high-temperature superconductor that no one understands. Those are the cuprates (and now iron based exotica).
What's really interesting about this potential discovery isn't just that it exhibits superconductivity at a relatively high temperature but that it seems to be a conventional superconductor. That should give some insight that a slightly better cuprate might not.
What's really interesting about this potential discovery isn't just that it exhibits superconductivity at a relatively high temperature but that it seems to be a conventional superconductor. That should give some insight that a slightly better cuprate might not.