We have used cavity perturbation techniques to study the microwave surface impedance of the heavy fermion intermetalic compound UPt3 in the superconducting and normal states. The surface impedance as a function of temperature was measured in the frequency range from ∼ 9 to 38 GHz. These microwave photon energies are about 20% to 95% of the estimated zero-temperature energy gap of UPt3. A change of slope was observed in the resistance vs. temperature curves at Tc. No evidence for a collective mode was observed for all the frequencies down to the lowest temperature reached ( ∼ 0.1 K).
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering