Abstract
In the borocarbide superconductor YC the de Haas-van Alphen (dHvA) oscillations have been observed continuously at the upper critical field for the transition from the normal into the superconducting state. In the normal state above T six different frequencies were found in magnetic fields up to 23 T and for . The smallest orbit with T is present down to about 4 T, but with an additional attenuation of the dHvA signal in the superconducting state relative to an extrapolation of the standard Lifshitz-Kosevich formula. The observation of magnetoquantum oscillations over such a wide field range and very close to enables a detailed discussion of the damping in the context of recent theories of these oscillations in the superconducting state.
- Received 12 January 1996
DOI:https://doi.org/10.1103/PhysRevB.53.R8871
©1996 American Physical Society