By R. Göbel, L. Lady, A. Mader
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Extra resources for Abelian Group Theory. Proc. conf. Honolulu, 1983
Denotes the local resistivity of the contact area and has been approximated by ρ(T ) = ρbulk (T ) + ρi . ρi takes into account that the local resistivity might be enhanced by structural defects, boundary scattering or impurities. The solid lines in Fig. 3 are calculated with ρi = 6 µΩ cm and L = 2L0 for all T by numerical diﬀerentiation of the above equation for I(V), evidentially proving that thermal eﬀects dominate the point-contact spectra in this T range. In the diﬀusive regime it is still possible to obtain direct energy-resolved information about the inelastic scattering of the electrons as in the ballistic regime.
6. The ﬁt curves are hardly visible because of the perfect agreement with the data. Minima in the diﬀerential resistance are expected for V ≤ ∆/e for both conventional superconductors  and unconventional superconductors . 13) cannot simply be replaced by ∆(k). (2) The gap value ∆/e cannot directly be read from the position of the minima in dV/dI. The position of the minima depends on the choice of the orderparameter symmetry, the microscopic details of the contact and the barrier strength.
In an external magnetic ﬁeld the magnetic dipole moments of nuclei are partially aligned, and the magnetization can be changed by irradiating with a radiofrequency. The important concepts of nuclear magnetization and resonance absorption are widely discussed in a number of textbooks  and therefore, will not be repeated here. However, two items will be focused on in the following, namely the Knight shift K = ∆ω/ω which is the shift ∆ω of the nuclear resonance at ω by polarized conduction electrons and the nuclear relaxation rate 1/T 1 which accounts for the spinlattice relaxation process in metals due to spin-ﬂip scattering of conduction electrons by the nucleus.