Lateral-Size Effects and Supercurrent Blockade at Mechanical-Controllable Break Junctions of the Heavy-Fermion Superconductors
- Cite this article as:
- Gloos, K., Anders, F.B., Aßmus, W. et al. Journal of Low Temperature Physics (1998) 110: 873. doi:10.1023/A:1022633028112
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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.