dHvA Oscillations in High-Tc Compounds

摘要: Recent de Haas-van Alphen (dHvA) experiments on high-Tc compounds have been interpreted using Lifshitz-Kosevich (LK) theory, which ignores many-body effects. However in quasi-2d systems, interactions plus Landau level quantization give strong singularities the self-energy $\Sigma$ and thermodynamic potential $\Omega$. These are rapidly suppressed as one increases c-axis tunneling amplitude $t_\perp$ and/or impurity scattering. We show that 2d-3d crossover interaction effects should up these experiments, they can lead to deviations from LK behaviour. Moreover, dHvA systems clearly distinguish between Fermi liquid non-Fermi states, for sufficiently weak