DE-HAAS-VAN-ALPHEN EFFECT STUDY OF CERH2SI2

The de Haas-van Alphen (dHvA) effects have been studied in an antiferr omagnetic heavy Fermion compound CeRh2Si2 with fields in the high symm etry planes of (001), (1 (1) over bar 0) and (010). More than twenty s eparate dHvA branches have been observed ranging from 33 T to 9170 T; most of the branches are observed in limited regions of the field dire ctions: The largest cyclotron mass obtained is 4.4 m(0), which is rath er small compared to the estimate from the Sommerfeld coefficient. Thi s implies that heavy Fermi surfaces remain uncovered.