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Characteristics of CeCoIn5/Al/AlOx/Nb and CeCoIn5/Al/AlOx/Al tunnel junctions |
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| Authors: | IP Nevirkovets O Chernyashevskyy C Petrovic Rongwei Hu JB Ketterson Bimal K Sarma |
| Institution: | 1. Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA;2. Condensed Matter Physics, Brookhaven National Laboratory, Upton, NY 11973-5000, USA;3. Physics Department, Brown University, Providence, RI 02912, USA;4. Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208, USA;5. Materials Research Center, Northwestern University, Evanston, IL 60208, USA;6. Department of Physics, University of Wisconsin, Milwaukee, WI 53201, USA |
| Abstract: | We report characteristics of CeCoIn5/Al/AlOx/Nb and CeCoIn5/Al/AlOx/Al tunnel junctions fabricated on the (0 0 1) surface of CeCoIn5 crystal platelets. The main result of this work is the observation of a low Josephson current (as compared with that expected from the Ambegaokar–Baratoff formula), which is consistent with idea that the order parameter in the heavy-fermion superconductor CeCoIn5 has unconventional pairing symmetry. |
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