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2. Consider a thin superconducting slab of thickness 2L with the centre at x=0. If the external parallel magnetic field $B_0$ is applied parallel to the slab surfaces, show that inside the slab the magnetic field is $B_x(x)/B_0 = \cosh(x/\lambda)/\cosh(L/\lambda)$ 3. What will be the London penetration depth in Al at 0K under the assumption (a) that all the valence electrons are responsible for the superconducting property and (b) only electrons in an energy interval $\Delta$ in the neighbourhood of the Fermi Energy contribute to the supercurrent ($2\Delta$ for aluminium is 0.34 meV).

          2. Consider a thin superconducting slab of thickness 2L with the centre at x=0. If the external parallel magnetic field $B_0$ is applied parallel to the slab surfaces, show that inside the slab the magnetic field is
$B_x(x)/B_0 = \cosh(x/\lambda)/\cosh(L/\lambda)$
3. What will be the London penetration depth in Al at 0K under the assumption (a) that all the valence electrons are responsible for the superconducting property and (b) only electrons in an energy interval $\Delta$ in the neighbourhood of the Fermi Energy contribute to the supercurrent ($2\Delta$ for aluminium is 0.34 meV).

2. Consider a thin superconducting slab of thickness 2L with the centre at x=0. If the external parallel magnetic field B0 is applied parallel to the slab surfaces, show that inside the slab the magnetic field is
Bx(x)/B0 = cosh(x/λ)/cosh(L/λ)
3. What will be the London penetration depth in Al at 0K under the assumption (a) that all the valence electrons are responsible for the superconducting property and (b) only electrons in an energy interval Δ in the neighbourhood of the Fermi Energy contribute to the supercurrent (2Δ for aluminium is 0.34 meV).

Added by Celia F.

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