7. Superconductivity - University of Liverpool
7. Superconductivity - University of Liverpool
7. Superconductivity - University of Liverpool
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So if we choose the loop L away from either surfaces, then the<br />
current density along L would be zero. The equation<br />
then becomes<br />
2nπ = m ρq<br />
∫<br />
L<br />
2nπ = qΦ.<br />
J.dl + qΦ.<br />
Since q is the charge <strong>of</strong> an electron, the flux is<br />
Φ = nh<br />
e .<br />
This means that one quantum step is h/e.<br />
We have just found a problem.<br />
<strong>Superconductivity</strong> 42