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Momentum of superconducting electrons and the explanation of the Meissner effect | | J. E. Hirsch
; | | Date: |
22 Sep 2016 | | Abstract: | Momentum and energy conservation are fundamental tenets of physics, that
valid physical theories have to satisfy. In the reversible transformation
between superconducting and normal phases in the presence of a magnetic field,
the mechanical momentum of the supercurrent has to be transferred to the body
as a whole and vice versa, the kinetic energy of the supercurrent stays in the
electronic degrees of freedom, and no energy is dissipated in the process. We
argue on general grounds that to explain these processes it is necessary that
the electromagnetic field mediates the transfer of momentum between electrons
and the body as a whole, and this requires that when the phase boundary between
normal and superconducting phases is displaced, a flow and counterflow of
charge occurs in direction perpendicular to the phase boundary. This flow and
counterflow does not occur according to the conventional BCS-London theory of
superconductivity, therefore we argue that within BCS-London theory the
Meissner transition is a ’forbidden transition’. Furthermore, to explain the
phase transformation in a way that is consistent with the experimental
observations requires that (i) the wavefunction $and$ charge distribution of
superconducting electrons near the phase boundary extend into the normal phase,
and (ii) that the charge carriers in the normal state have hole-like character.
The conventional theory of superconductivity does not have these physical
elements, the theory of hole superconductivity does. | | Source: | arXiv, 1609.8451 | | Services: | Forum | Review | PDF | Favorites | |
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