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We have observed the de Haas-van Alphen (dHvA) oscillation in both the normal and superconducting mixed states of CeRu 2 . The dHvA amplitude in the mixed state is extremely reduced for the large cyclotron orbit or the carrier with a large cross-sectional area of the Fermi surface compared to the small one. We have detected three dHvA branches, ranging from 6×10 5 Oe to 2.3×10 7 Oe. The origin of these branches is well explained by the 4 f -itinerant band model.
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Hedo et al. (1995) studied this question.
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