Quantum critical point in high-temperature superconductors

TL;DR

This paper explains the complex behavior of high-temperature superconductors and related materials using a fermion condensation quantum phase transition theory, unifying their physical properties despite different microscopic natures.

Contribution

It introduces a theory based on fermion condensation quantum phase transition to explain experimental observations in high-T_c superconductors and related systems.

Findings

Unified explanation for behaviors in HTSC, heavy-fermion metals, and 2D 3He.

Identification of a quantum critical point influencing superconducting and normal states.

Demonstration of similar physical properties across different quantum materials.

Abstract

Recently, in high-T_c superconductors (HTSC), exciting measurements have been performed revealing their physics in superconducting and pseudogap states and in normal one induced by the application of magnetic field, when the transition from non-Fermi liquid to Landau Fermi liquid behavior occurs. We employ a theory, based on fermion condensation quantum phase transition which is able to explain facts obtained in the measurements. We also show, that in spite of very different microscopic nature of HTSC, heavy-fermion metals and 2D 3He, the physical properties of these three classes of substances are similar to each other.