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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)

Abstract

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.

Keywords

Fermi Surface Critical Field Cooper Pair Superconducting Transition Temperature Lower Critical Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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