|John Bardeen, Leon Cooper, John Robert Schrieffer physics|
John Bardeen collaborated with Leon Cooper and John Robert Schrieffer to explain superconductivity using Cooper’s concept of Cooper pairs. The Pauli exclusion principle creates a Fermi surface that warps in the presence of an electron to attract a second electron, overcoming their Coulomb repulsion. The electron pairs create a Fermionic condensate and vibrates in a shared quantum state to become superfluidic, superconductive, and diamagnetic.
It was an educated guess confirmed by later experiments. It was only a theory that predicted testable implications. It was an approximation and further work was needed.
Theoretical physics, a math problem, a concept of how things work together becomes less theoretical when it changes lives and makes miracles common.