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On the dynamics of the Meissner effect | | J. E. Hirsch
; | | Date: |
13 Aug 2015 | | Abstract: | The question of how a metal becoming superconducting expels a magnetic field
is addressed. It is argued that the conventional theory of superconductivity
has not answered this question despite its obvious importance. We argue that
the growth of the superconducting into the normal region and associated
expulsion of magnetic field from the superconducting region can only be
understood if it is accompanied by motion of charge from the superconducting
into the normal region. From a microscopic point of view it is shown that the
perfect diamagnetism of superconductors requires that superconducting electrons
reside in orbits of spatial extent $2lambda_L$, with $lambda_L$ the London
penetration depth. Associated with this physics, the spin-orbit interaction of
the electron magnetic moment and the positively charged ionic background gives
rise to a "Spin Meissner" effect, the generation of a macroscopic spin current
near the surface of superconductors. We point out that both the Meissner and
the Spin Meissner effect can be understood dynamically under the assumption
that the superfluid condensate wavefunction $Psi(vec{r})$ does not screen
itself, just like the $Psi(vec{r})$ for an electron in a hydrogen atom. We
argue that the conventional theory of superconductivity cannot explain the
Meissner effect because it does not contain the physical elements discussed
here. | | Source: | arXiv, 1508.3307 | | Services: | Forum | Review | PDF | Favorites | |
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