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
Article

Abstract

Break junctions of the heavy-fermion superconductors CeCu2Si2, UBe13, UPt3, URu2Si2, UPd2Al3, and UNi2Al3have 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.

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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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