  The magnetic field dependence of the capacitance of Pd-AlOx-Al thin-film
structures has been measured. The observed quadratic dependence of capacitance
on magnetic field is consistent with a theoretical model that includes the
effect of a spin-dependent electrochemical potential on electron screening in
the paramagnetic Pd. This spin-dependent electrochemical potential is related
to the Zeeman splitting of the narrow d-bands in Pd. The quantitative details
depend on the electronic band structure at the surface of Pd.
