Abstract
We observed de Haas-van Alphen (dHvA) oscillation in both thenormal and superconducting mixed states of a heavy-fermionsuperconductor CeCoIn5. The Fermi surfaces are found to consist ofnearly cylindrical Fermi surfaces and small ellipsoidal ones,reflecting the unique tetragonal crystal structure. The detectedcyclotron masses of 5-87 m0 for these Fermi surfaces areextremely large, and correspond to a large electronic specificheat coefficient of about 1000 mJ K-2 mol-1. The cyclotronmasses are also found to be field dependent in both the normal andmixed states.
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