We report observation of the de Haas-van Alphen oscillations in the mixed state as well as in the normal state of LuNi2 B2 C. Two oscillations α and η are observed in the mixed state. In particular, the α oscillation can be studied not only deep in the mixed state as a function of magnetic field but also as a function of field direction. The damping rate of the oscillations due to superconductivity is found to be very anisotropic. For fields far below Hc2, the damping behavior is anomalous and cannot be explained only in terms of the superconducting gap. We argue that both the anisotropy of the gap and a disorder of the flux line lattice are responsible for the anisotropic and anomalous behavior of the damping in the mixed state.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2008 Oct 30|