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VOLUME 101 | ISSUE 6 | PAGE 446
Occurrence of flat bands in strongly correlated Fermi systems and high-Tc superconductivity of electron-doped compounds
We consider a class of strongly correlated Fermi systems that exhibit an interaction-induced flat band pinned to the Fermi surface, and generalize the Landau strategy to accommodate a flat band and apply the more comprehensive theory to electron systems of solids. The non-Fermi-liquid behavior that emerges is compared with relevant experimental data on heavy-fermion metals and electron-doped high-Tc compounds. We elucidate how heavy-fermion metals have extremely low superconducting transition temperature Tc, its maximum reached in the heavy-fermion metal CeCoIn5 does not exceed 2.3 K, and explain the enhancement of Tc observed in high-Tc superconductors. We show that the coefficient A1 of the T-linear resistivity scales with Tc, in agreement with the experimental behavior uncovered in the electron-doped materials. We have also constructed schematic temperature-doping phase diagram of the copper oxide superconductor La2-xCexCuO4 and explained the doping dependence of its resistivity.