Journal of Low Temperature Physics

, Volume 110, Issue 3–4, pp 873–884 | Cite as

Lateral-Size Effects and Supercurrent Blockade at Mechanical-Controllable Break Junctions of the Heavy-Fermion Superconductors

  • K. Gloos
  • F. B. Anders
  • W. Aßmus
  • B. Buschinger
  • C. Geibel
  • J. S. Kim
  • A. A. Menovsky
  • R. Müller-Reisener
  • S. Nuettgens
  • C. Schank
  • G. R. Stewart
  • Yu. G. Naidyuk


Break junctions of the heavy-fermion superconductors CeCu 2 Si 2 , UBe 13 , UPt 3 , URu 2 Si 2 , UPd 2 Al 3 , and UNi 2 Al 3 have been investigated. Josephson-like superconducting anomalies could be found only for low-ohmic contacts, but without the oscillatory Fraunhofer pattern of the critical current in a magnetic field. A systematic study on the contact radius demonstrates that these anomalies are mainly due to Maxwell's resistance being suppressed in the superconducting heavy-fermion phase rather than due to Josephson effect and Andreev reflection. We could not find any superconducting features by vacuum-tunneling spectroscopy.


Spectroscopy Magnetic Field Reflection Magnetic Material Systematic Study 
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 Publishing Corporation 1998

Authors and Affiliations

  • K. Gloos
    • 1
  • F. B. Anders
    • 1
    • 2
  • W. Aßmus
    • 3
  • B. Buschinger
    • 1
  • C. Geibel
    • 1
  • J. S. Kim
    • 4
  • A. A. Menovsky
    • 5
  • R. Müller-Reisener
    • 1
  • S. Nuettgens
    • 3
  • C. Schank
    • 1
  • G. R. Stewart
    • 4
    • 6
  • Yu. G. Naidyuk
    • 7
  1. 1.Institut für FestkörperphysikTechnische Universität DarmstadtDarmstadtGermany
  2. 2.Department of PhysicsThe Ohio State UniversityColumbusUSA
  3. 3.Physikalisches InstitutJohann Wolfgang Goethe UniversitätFrankfurt/MainGermany
  4. 4.Department of PhysicsUniversity of FloridaGainesvilleUSA
  5. 5.Van der Waals-;Zeeman LaboratoryUniversity AmsterdamAmsterdamThe Netherlands
  6. 6.Institut für PhysikUniversität AugsburgAugsburgGermany
  7. 7.Institute for Low Temperature Physics and EngineeringKharkivUkraine

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