Quasiparticles in the Superconducting State of High-T_c Metals

TL;DR

This paper explores quasiparticle behavior in high-T_c superconductors, linking it to fermion condensation theory, and shows agreement with experimental observations, revealing how exotic properties are influenced by the fermion condensate.

Contribution

It introduces a fermion condensation framework to explain quasiparticle behavior and exotic properties in high-T_c superconductors, aligning theory with recent experiments.

Findings

Quasiparticles behave like Bogoliubov quasiparticles.

Superconducting gap is influenced by fermion condensate.

Normal state can be a Landau Fermi liquid under magnetic field.

Abstract

We consider the behavior of quasiparticles in the superconducting state of high-T_c metals within the framework of the theory of superconducting state based on the fermion condensation quantum phase transition. We show that the behavior coincides with the behavior of Bogoliubov quasiparticles, whereas the maximum value of the superconducting gap and other exotic properties are determined by the presence of the fermion condensate. If at low temperatures the normal state is recovered by the application of a magnetic field suppressing the superconductivity, the induced state can be viewed as Landau Fermi liquid. These observations are in good agreement with recent experimental facts.