Distortion of the lattice creates a well:

• Distortion of the lattice creates a well:

• The more wobbly the lattice, the easier it is distorted to form a well, and the more the electron pair is bound against thermal disturbances (high Tcritical) and against disruption by a magnetic field (high Bcritical), so you create alloys more wobbly until they become unstable => Tcritical about 20K, with a well thousands of atoms across.

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