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Using the conventional phonon-exchange mechanism of superconductivity we have succeeded in reproducing the transition temperature Tc of a large number of newly discovered high Tc superconductors by introducing a certain modification to the well-known BCS-formula for T c.

A self-consistent method for determining the effective mass, m*, of electrons in metals is presented. This is done through the evaluation of the electronic specific heat of metallic solids. The calculated values for m* agree remarkably well with the experimental data for sodium and potassium.Eine selbstkonsistente Methode zur Bestimmung der effektiven Masse, m*, von Elektronen in Metallen wird angegeben. Dies wird durch die Berechnung der elektronischen spezifischen Wiirme von metallischen Festkorpern verwirklicht. Die berechneten Werte fiir m* stimmen bemerkenswert gut mit den experimentellen Werten fur Natrium und Kalium iiberein.

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