Microwave surface resistance measurements on the heavy fermion superconductor UPt3 |
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Affiliation: | 1. Department of Pediatrics and Emergency Medicine, Perelman School of Medicine at the University of Pennsylvania, Children''s Hospital of Philadelphia (D Cullen and J Fein), Philadelphia, Pa;2. Department of Population Health, Children''s Hospital of Philadelphia (L Wilson-Hall), Philadelphia, Pa;3. Department of Clinical Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Children''s Hospital of Philadelphia (K McPeak), Philadelphia, Pa |
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Abstract: | The relative change of the microwave surface resistance has been measured as a function of temperature in the superconducting and normal states of UPt3 using a cavity perturbation technique. With our frequency range of ∼9–38 GHz, the microwave photon energy (ℏω) is ∼20–95% of the estimated zero-temperature (BCS) energy gap (2Δ0) of UPt3. The surface resistance shows a change in slope as the signature of Tc and has a significantly weaker temperature dependence 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 temperatures measured (∼0.1 K). |
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