The Role of Fermi Surface Anisotropies in Heavy-Fermion Superconductors

  • U. Rauchschwalbe
  • F. Steglich
Part of the NATO ASI Series book series (NSSB, volume 184)


We present evidence that at the superconducting transition temperature Tc of the Heavy-Fermion-Superconductors CeCu2Si2 and Ube13, the order parameter is formed only on part of the Fermi-surface. In UBe13, at least part of the Fermi-surface that does not participate in superconductivity at Tc = 0.9K develops an order parameter in the accessible temperature range, i.e. at 0.55K. The effect can be sharply enhanced by doping UBe13 with a few at% Th, leading to a second phase transition within the superconducting state. In CeCu2Si2, those parts of the Fermi surface which do not participate in superconductivity down to the lowest temperatures carry a small effective mass. The influence of impurities on the Fermi-surface anisotropy is discussed.


Fermi Surface Critical Field Cooper Pair Superconducting Transition Temperature Lower Critical Field 
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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • U. Rauchschwalbe
    • 1
  • F. Steglich
    • 1
  1. 1.Institut f. FestkörperphysikTechnische HochschuleDarmstadtGermany

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