“Small” Masses and Strong Coupling in High-Tc Superconductors and in Heavy-Fermion Compounds
Competition between short-ranged correlations and the Luttinger sum rule lead to a peculiar duality of the electron spectrum: two different effective masses have to be attributed to the same Fermi excitation. One of them corresponds to the band width measured by photoemission spectroscopy, the other may be much smaller in the highly correlated system. The residual Coulomb repulsion between excitations is reduced, and this, probably, has a direct relation to the high-T c problem. A phenomenological description of these phenomena in the framework of Fermi-liquid theory is discussed in connection with high-T c superconductivity and heavy-fermion physics.
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