Microwave surface resistance measurements on the heavy fermion superconductor UPt3

✍ Scribed by C.T Lin; Bimal K Sarma; J.B Ketterson

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 84 KB
• Volume: 260
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00520-4

✦ Synopsis

The relative change of the microwave surface resistance has been measured as a function of temperature in the superconducting and normal states of UPt using a cavity perturbation technique. With our frequency range of ; 9-38 3 Ž . Ž . Ž . GHz, the microwave photon energy " v is ; 20-95% of the estimated zero-temperature BCS energy gap 2 D of UPt . 0 3

The surface resistance shows a change in slope as the signature of T and has a significantly weaker temperature dependence c in the superconducting state than would be predicted by the Mattis-Bardeen theory. At higher frequencies, the slope tends to change by a smaller amount. No indication of collective modes at any of the frequencies was observed down to the lowest Ž . temperatures measured ; 0.1 K .