Vacuum tunneling and josephson effect in heavy fermion superconductors

✍ Scribed by U. Poppe

• Publisher: Elsevier Science
• Year: 1985
• Weight: 27 KB
• Volume: 135
• Category: Article
• ISSN: 0378-4363
• DOI: 10.1016/0378-4363(85)90423-1

✦ Synopsis

Vacuum tunneling experiments as well as Josephson current measurements on heavy Fermion superconductors have been performed. In a point contact between the ordinary singlet superconductor A1 and CeCu2Si 2 a Josephson current could be observed. The value of the critical current I c was between 15 and 80% of the theoretical upper limit. From this we conclude that at least CeCu2Si 2 does not behave like a p-wave superconductor. Furthermore a typical interference pattern of I c with an external magnetic field could be measured. In the case of a UPt 3 single crystal no Josephson current could be observed. For UPt 3 no significant structure in the quasiparticle density of states obtained by vacuum tunneling could be observed.