Magnetic field-induced Landau Fermi Liquid in high-T_c metals

TL;DR

This paper demonstrates that applying a magnetic field to high-T_c superconductors induces a Landau Fermi Liquid state with properties consistent with experimental observations, highlighting the role of fermion condensation.

Contribution

It introduces the fermion condensation model to explain the magnetic field-induced Landau Fermi Liquid state in high-T_c metals, showing field-dependent quasiparticle effective mass.

Findings

Wiedemann-Franz law holds in high-T_c cuprates under magnetic field

Korringa law verified in electron-doped cuprates

Effective mass of quasiparticles depends on magnetic field

Abstract

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.