SUPERCONDUCTIVITY IN METALS WITH INCOMPLETE INNER SHELLS.
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Through screening by outer (s) electrons the plasma oscillations of inner (d) bands are transformed into an acoustic phonon branch if certain conditions are fulfilled. Similar to the lattice-phonon branch this provides an interaction with free electrons which leads to superconductivity. Dependence of the transition temperature Tc on the number of d electrons follows Matthias' rule. Suggestions for increasing Tc are discussed.
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