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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Theory of the upper critical fieldH c2 in antiferromagnetic superconductors (1981)
    Springer
    The European physical journal 43 (1981), S. 23-31 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of antiferromagnetic order on the upper critical field of superconductors is investigated within the framework of Eliashberg theory. Below the Néel temperature the superconductor is characterized by Cooper pairs of quasiparticle states which are related by time reversal followed by a lattice translation. This leads to a change in the effective attraction between the quasiparticles which we calculate explicitely for the Chevrel phase compounds RE Mo6S8 (RE=Gd, Tb, and Dy). The results for the upper critical fields clearly show that our theory yields a consistent explanation of the experimentally observed anomalous behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295471
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the theory of superconductivity in Kondo lattice systems (1984)
    Springer
    The European physical journal 54 (1984), S. 111-120 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388062
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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