and a phonon act as bosons which are then capable of collapsing into the ground state to establish a supercurrent with a resistivity near zero.

Derivation

Quantum mechanical effects become significant for physics in the range of the de Broglie wavelength. For condensed matter, this is when the de Broglie wavelength of a particle is greater than the spacing between the particles in the lattice that comprises the matter.The de Broglie wavelength

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