Quasiparticles of strongly correlated Fermi liquids at high temperatures and in high magnetic fields

TL;DR

This paper proposes that the fermion condensation quantum phase transition (FCQPT) explains the non-Fermi liquid behavior in strongly correlated Fermi liquids, with quasiparticles surviving at high temperatures and magnetic fields, challenging existing theories.

Contribution

It introduces the FCQPT framework as a fundamental law explaining NFL behavior and quasiparticle properties in strongly correlated systems, surpassing traditional approaches.

Findings

Quasiparticles survive at high temperatures and magnetic fields.

FCQPT explains the scaling behavior and NFL properties.

Good agreement with experimental observations.

Abstract

Strongly correlated Fermi systems are among the most intriguing, best experimentally studied and fundamental systems in physics. There is, however, lack of theoretical understanding in this field of physics. The ideas based on the concepts like Kondo lattice and involving quantum and thermal fluctuations at a quantum critical point have been used to explain the unusual physics. Alas, being suggested to describe one property, these approaches fail to explain the others. This means a real crisis in theory suggesting that there is a hidden fundamental law of nature. It turns out that the hidden fundamental law is well forgotten old one directly related to the Landau---Migdal quasiparticles, while the basic properties and the scaling behavior of the strongly correlated systems can be described within the framework of the fermion condensation quantum phase transition (FCQPT). The phase transition comprises the extended quasiparticle paradigm that allows us to explain the non-Fermi liquid (NFL) behavior observed in these systems. In contrast to the Landau paradigm stating that the quasiparticle effective mass is a constant, the effective mass of new quasiparticles strongly depends on temperature, magnetic field, pressure, and other parameters. Our observations are in good agreement with experimental facts and show that FCQPT is responsible for the observed NFL behavior and quasiparticles survive both high temperatures and high magnetic fields.