Abstract

One branch has been detected in the de Haas–van Alphen (dHvA) experiments in both the normal and superconducting mixed states of URu 2Si 2 and UPd 2Al 3 with an anisotropic superconducting energy gap. The corresponding Dingle temperatures increase and the cyclotron effective masses decrease in the mixed states. An anisotropic energy gap with a line node has been discussed from the angular dependence of the dHvA amplitude in the mixed state.

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