Point-contact spectroscopy on the heavy-fermion superconductor UPt3

✍ Scribed by G. Goll; H.v. Löhneysen; I.K. Yanson; L. Taillefer

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 179 KB
• Volume: 199-200
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91751-5

✦ Synopsis

Point-contact spectroscopy has been used to study the superconducting properties of the heavy-fermion system UPt~ down to about .40 inK. The differential resistance of heterocontacts between UPt3 and Pt shows, for current flow parallel to the c direction, a distinct minimum at a low bias due to Andreev reflection. From the temperature and magnetic-field dependence of this structure, we infer that Andreev reflection is observable only in the low-temperature, low-magneticfield phase of this unconventional superconductor, giving clear evidence of different order parameters in the different superconducting phases.