It became the most widely publicized of the theories seeking to explain how the new superconductors work.
Materials science has already produced answers to some of the engineering problems posed by the new superconductors.
The reason is the striking recent development of new superconductors.
"No one is even close to fabricating the new high-temperature superconductors into anything like that."
The new superconductors, discovered in the last two years, can conduct electricity without resistance at far higher temperatures than previously possible.
It has now become clear that sheets of copper oxides are a key to the new superconductors.
And, even in their current state, the new superconductors have found some uses.
According to what is now the dominant school of thought, the key to understanding the new superconductors is electronic spin.
For the new superconductor, the upper limit seems surprisingly high.
There is great potential for the new superconductors.