Break junctions of the heavy-fermion superconductors
K. Gloos, F.B. Anders, B. Buschinger, and C. Geibel
TL;DR
This paper investigates the electrical properties of heavy-fermion superconductor break junctions, revealing that observed anomalies are due to resistance effects rather than direct superconducting features, and highlights the pair-breaking effects at interfaces.
Contribution
It provides a systematic analysis of contact size effects in heavy-fermion superconductor break junctions, clarifying the origin of superconducting anomalies and the absence of tunneling features.
Findings
Superconducting anomalies are mainly due to Maxwell's resistance suppression.
No superconducting features observed in vacuum-tunnelling spectroscopy.
Heavy-fermion interfaces exhibit pair-breaking effects.
Abstract
Mechanical-controllable break junctions of the heavy-fermion superconductors can show Josephson-like superconducting anomalies. But a systematic study on the contact size demonstrates that these anomalies are mainly due to Maxwell's resistance being suppressed in the superconducting heavy-fermion phase. Up to day, we could not find any superconducting features by vacuum-tunnelling spectroscopy, providing further evidence for the pair-breaking effect of the heavy-fermion interfaces.
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