Magnetic quantum oscillations in the normal state of YNi2B2C

We present de Haas–van Alphen (dHvA) measurements of different YNi 2 B 2 C single crystals in magnetic fields up to 32 T. At high magnetic fields three different dHvA frequencies could be detected. The lowest frequency, F α , could be well resolved down to lower fields just above the upper critical field. An unexpectedly sudden vanishing of the dHvA signal in the mixed state has been observed.