Non-Fermi-Liquid Properties and Exotic Superconductivity in CeCu2Si2 and (UTh)Be13

  • M. Lang
  • P. Gegenwart
  • R. Helfrich
  • M. Köppen
  • F. Kromer
  • C. Langhammer
  • C. Geibel
  • F. Steglich
  • J. S. Kim
  • G. R. Stewart


Tetragonal CeCu2Si2 [1] and cubic UBe13 [2] belong to the class of strongly correlated (electron materials where a periodic lattice of partially filled f shells is embedded in a metallic environment. Below a characteristic “Kondo temperature” Tk, typically of the order of 10K, quasiparticles composed of both local f degrees of freedom and itinerant conduction-electron degrees of freedom form. As has been inferred from the giant Sommerfeld coefficient r of about 1 J/K2mole, the huge effective quasiparticle masses m· (100–1000 mel) are governed by the f degrees of freedom. The discontinuity of the specific heat at Tc which was found to scale with the large γ [1, 2] proved that superconductivity is, indeed, formed by those heavy fermions (HF).


Heavy Fermion Quantum Critical Point Landau Fermi Liquid Heavy Fermion Superconductivity Relative Length Change 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • M. Lang
    • 1
  • P. Gegenwart
    • 1
  • R. Helfrich
    • 1
  • M. Köppen
    • 2
  • F. Kromer
    • 1
  • C. Langhammer
    • 1
  • C. Geibel
    • 1
  • F. Steglich
    • 1
    • 2
  • J. S. Kim
    • 3
  • G. R. Stewart
    • 3
    • 4
  1. 1.Max-Planck-Institut für Chemische Physik fester StoffeDresdenGermany
  2. 2.lnstitut für FestkörperphysikDarmstadtGermany
  3. 3.Department of PhysicsUniversity of FloridaGainesvilleUSA
  4. 4.lnstitut für PhysikUniversität AugsburgAugsburgGermany

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