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According to BCS theory, the cooper pairs have opposite momenta, but according to this animation http://www.superconductors.org/bcs_anim.GIF the electrons in the pair seem to move in the same direction. Arent the two information contradicting each other? Am I missing something here?

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  • $\begingroup$ It seems the animation tries to explain how an effective attractive interaction between electrons can arise from electron-phonon interaction, but the depiction of a bound pair moving together is deceiving. In fact, the size of the Cooper pair wavefunction can be quite large. As for the pair shown to having a nonzero net momentum, maybe the intention was to depict a Cooper pair current flowing. This old question may be relevant: physics.stackexchange.com/q/145705 $\endgroup$ – wcc Jun 20 '19 at 15:43

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