Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-04-18
Phys. Lett. A315, 288 (2003).
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, LaTex; New experimental facts and their explanations are added
Scientific paper
10.1016/S0375-9601(03)01013-2
We consider the behavior of strongly correlated electron liquid in high-temperature superconductors within the framework of the fermion condensation model. We show that at low temperatures the normal state recovered by the application of a magnetic field larger than the critical field can be viewed as the Landau Fermi liquid induced by the magnetic field. In this state, the Wiedemann-Franz law and the Korringa law are held and the elementary excitations are the Landau Fermi Liquid quasiparticles. Contrary to what might be expected from the Landau theory, the effective mass of quasiparticles depends on the magnetic field. The recent experimental verifications of the Wiedemann-Franz law in heavily hole-overdoped, overdoped and optimally doped cuprates and the verification of the Korringa law in the electron-doped copper-oxide superconductor strongly support the existence of fermion condensate in high-T_c metals.
Amusia Ya. M.
Shaginyan Vasily R.
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