Unconventional Superconductor Isn't So Odd After All

As electrons move through a Bardeen-Cooper-Schrieffer (BCS) superconductor, they attract positive charges in the lattice, and the subsequent deformation leads to an attractive interaction between time-reversed electron states. Below some critical transition temperature Tc, that electron–phonon interaction forms Cooper pairs of electrons with s-wave symmetry, and their collective behavior constitutes a macroscopic quantum state of matter.

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