Abstract
The de Haas-van Alphen (dHvA) effects have been studied in an antiferromagnetic heavy Fermion compound CeRh 2 Si 2 with fields in the high symmetry planes of (001), (1\=10) and (010). More than twenty separate dHvA branches have been observed ranging from 33 T to 9170 T; most of the branches are observed in limited regions of the field directions. The largest cyclotron mass obtained is 4.4 m 0 , which is rather small compared to the estimate from the Sommerfeld coefficient. This implies that heavy Fermi surfaces remain uncovered.
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