Abstract
To examine the Fermi surfaces of the recently discovered quaternery compounds RENi2B2C measurements of the de Haas-van Alphen (dHvA) effect were made on YNi2B2C single crystals in magnetic fields up to 12 T. ForB‖c we observe two dHvA frequenciesF1=0.499 kT andF2=6.933 kT which corresponds to approximately 1,5% and 21% of the Brillouin zone cross section area. Both frequencies could be observed deep in the vortex state of the type-II superconductor, the lower dHvA frequency down to 2 T corresponding to roughly 1/5 of the upper critical fieldBc2 which was found to be 10.6 T in resistivity measurements. The field dependent quasiparticle damping in the superconducting state is very weak, since the amplitude of the dHvA oscillations seems to be unaffected by the phase transition atBc2.
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