October 2009
Intermediate to advanced
503 pages
14h 28m
English
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9.4 Penetration depth
In 1935, F. London and H. London obtained an expression for penetration of applied magnetic field into superconducting material from the surface by adding: (i) Meissner effect i.e., the magnetic induction (B) inside a superconducting material is equal to zero (B = 0) and (ii) zero resistivity i.e., the intensity of electric field (E) in a superconductor in superconducting state is equal to zero (E = 0) to Maxwell’s electromagnetic equations. According to them, the applied magnetic field does not drop to zero at the surface of the superconductor [in superconducting state] but decreases exponentially as given by the equation:
where H is the intensity of magnetic field at a depth x from the surface, H0 is the intensity of ...
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