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On the theory of superconductivity in Kondo lattice systems

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Zeitschrift für Physik B Condensed Matter

Abstract

An attempt is made to explain the occurrence of superconductivity in Kondo lattice systems with special reference to CeCu2Si2. Starting point is the Fermi liquid approach. It is generalized from a Kondo impurity to the Kondo lattice by means of the Korringa-Kohn-Rostocker method. From it a hybridization model is derived and discussed in detail. Two electron-phonon mechanisms are investigated which appear in Kondo lattices. One results from the additional phase shifts caused by the Kondo ions while the other is responsible for the so-called Kondo volume collapse. It is shown that the latter is sufficiently strong in order to explain why CeCu2Si2 is a superconductor while LaCu2Si2 is not. An estimate for the superconducting transition temperatureT c produces the right order of magnitude.

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Razafimandimby, H., Fulde, P. & Keller, J. On the theory of superconductivity in Kondo lattice systems. Z. Physik B - Condensed Matter 54, 111–120 (1984). https://doi.org/10.1007/BF01388062

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  • DOI: https://doi.org/10.1007/BF01388062

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