Isotopeneffekt und Druckkoeffizient der Übergangstemperatur zur Supraleitung in der EliashbergTheorie / Isotope Effect and Pressure Coefficient of the Superconducting Transition Temperature within the EliashbergTheory
Abstract
Isotope Effect and Pressure Coefficient of the Superconducting Transition Temperature within the EliashbergTheory Starting from the observation that both the mass of the ions and their volume control the phonon frequencies by stretching the phonon spectrum, the change of the Eliashbergequations of the theory of superconductivity regarding these stretchings is considered. General expressions for the isotopic exponent and the pressure coefficient of the transition temperature are derived in which only derivatives of the transition temperature with respect to the fundamental parameters of the theory are involved. A comparison with experimental values shows that lead is not the metal with the highest transition temperature possible under the simple metals.
 Publication:

Zeitschrift Naturforschung Teil A
 Pub Date:
 February 1975
 DOI:
 10.1515/zna19750220
 Bibcode:
 1975ZNatA..30..250K
 Keywords:

 Electron Phonon Interactions;
 Isotope Effect;
 Superconductivity;
 Transition Temperature;
 Atomic Weights;
 Lead (Metal);
 Metal Ions;
 Pressure Effects;
 Physics (General)