DE-HAAS-VAN-ALPHEN EFFECT OF STAGE-1 CDCL2 INTERCALATED GRAPHITE

The de Haas-van Alphen (dHvA) effect of the stage-1 compound intercala ted with CdCl2 has been investigated with magnetic fields up to 14 T a nd for temperatures between 50 mK and 1.87 K. There are two dominant o scillations with values of 1144 and 1190 T with the magnetic field par allel to the c axis. The average value of the mass for these two frequ encies is (0.26+/-0.01)m(0), where m(0) is the mass of the electron. T he change of the frequencies with magnetic-field direction shows that the Fermi surface is an undulating cylinder directed along the c axis with a 4% difference between the minimum and maximum cross-sectional a reas. The Fermi energy determined from the Holzwarth band model is -1. 113 eV. There is also a dHvA frequency of 334 T with the magnetic fiel d parallel to the c axis from a minority carrier.