抄録
We succeeded in growing a high-quality single crystal of the heavyfermion superconductor UPd2Al3 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 areaof the electron Fermi surface labelled α, does not change inmagnitude between the normal and mixed states, while the cyclotron mass of5.7, m0 in the normal state is reduced to 3.5, m0 at 0.7, Hc2, and the corresponding Dingle temperature of 0.20, K in the normalstate is increased to 0.39, K at 0.7, Hc2. Here, Hc2 of 39, kOe is the upper critical field along the [0001]direction in the hexagonal structure.
