The equation can be obtained from the fact that the "canonical momentum of the ground grstate of superconductor is zero", but where does this fact follow from.(adsbygoogle = window.adsbygoogle || []).push({});

P.S. Jackson gives a vague reference to Kittel, which I couldn't find in his Introduction_to_solid_state/Quantum_theory_of_Solids.

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# Deriving the London's equation for superconductor

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