ABSTRACT
In addition to these mentioned problems, some more points were considered in [29], namely the field in a superconducting half-space and critical fields for plates (films) in the case where superconductivity is destroyed by the field and current. The penetration depth of the field in a superconducting half-space adjoining a vacuum has the form
where Ho is the external field (the field for z = 0) and, by definition, 8 = J000 H(z)dz/ Ho. The nonlinearity of the electrodynamics of superconductors, which was assumed already in [48] and is reflected in the dependence of 8 on Ho, is fairly small. So, even for re = 1/v'2 and H0 =Hem, the depth is 8 = 1.0780 . In 1950, there were no accurate enough experimental measurements of 8(H). I am not sure that they have yet been carried out, though it is probable.
