Abstract
We succeeded in growing a high-quality single crystal of the heavy fermion superconductor UPd 2 Al 3 and observed the de Haas-van Alphen (dHvA) oscillation in both the normal and superconducting mixed states. The dHvA frequency, which is proportional to a maximum cross-sectional area of the electron Fermi surface labelled α, does not change in magnitude between the normal and mixed states, while the cyclotron mass of 5.7 m 0 in the normal state is reduced to 3.5 m 0 at 0.7 H c2 , and the corresponding Dingle temperature of 0.20 K in the normal state is increased to 0.39 K at 0.7 H c2 . Here, H c2 of 39 kOe is the upper critical field along the [0001] direction in the hexagonal structure.
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