Home
For authors
Submission status

Archive
Archive (English)
Current
   Volumes 113-119
   Volumes 93-112
      Volume 112
      Volume 111
      Volume 110
      Volume 109
      Volume 108
      Volume 107
      Volume 106
      Volume 105
      Volume 104
      Volume 103
      Volume 102
      Volume 101
      Volume 100
      Volume 99
      Volume 98
      Volume 97
      Volume 96
      Volume 95
      Volume 94
      Volume 93
Search
VOLUME 101 (2015) | ISSUE 6 | PAGE 446
Occurrence of flat bands in strongly correlated Fermi systems and high-Tc superconductivity of electron-doped compounds
Abstract
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.