de Haas-van Alphen Effect in the Heavy-Electron Compound CeCu6

Abstract
We report measurements of the de Haas-van Alphen effect in the heavy-electron metal CeCu6 in the coherent state. Cyclotron masses of up to 40m0 are observed and we deduce a many-body enhancement 20 times larger than in LaCu6. We conclude from the absence of any light electrons that the many-body renormalization leading to the coherent state influences all electrons, and not just those with primarily f character.

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