The complex microwave impedance in the frequency range of ∼ 8-36 GHz was measured in the superconducting state of a well-characterized heavy fermion single crystal of UBe13. This microwave photon energy ranges roughly from 15% to 60% of the zero-temperature (BCS) energy gap and is higher than previous measurements. Large changes are observed in the complex impedance when the sample is cooled below Tc for all frequencies measured. The surface impedance cannot be described by the Mattis-Bardeen theory in the dirty limit for a conventional superconductor.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section A: General, Atomic and Solid State Physics|
|State||Published - Jul 8 1996|
ASJC Scopus subject areas
- Physics and Astronomy(all)