Critical quasiparticle theory: Scaling, thermodynamic and transport properties

TL;DR

This paper applies the critical quasiparticle theory to analyze the scaling, thermodynamic, and transport properties near a quantum critical point in correlated metals, successfully explaining experimental observations in YbRh2Si2.

Contribution

It introduces a comprehensive application of critical quasiparticle theory to quantum criticality, deriving scaling laws and thermodynamic behavior consistent with experiments.

Findings

Accurately describes the scaling behavior at the QCP

Derives critical behavior of specific heat, resistivity, and thermopower

Matches experimental results in YbRh2Si2

Abstract

We use the recently developed critical quasiparticle theory to derive the scaling behavior associated with a quantum critical point (QCP) in a correlated metal. This is applied to the magnetic-field induced QCP observed in YbRh$_2$Si$_2$ (YRS), for which we also derive the critical behavior of the specific heat, resistivity, Gr{\" u}neisen coefficient, and the thermopower. The theory accounts very well for the experimental results