Understanding the Heavy Fermion Phenomenology from Microscopic Model

TL;DR

This paper investigates the heavy fermion behavior using a microscopic model, revealing the phase diagram, spin fluctuations, and critical phenomena near the quantum critical point through advanced computational methods.

Contribution

It applies two impurity DMFT to solve the 3D periodic Anderson model, providing new insights into the quantum critical behavior and spin dynamics in heavy fermion systems.

Findings

Neel and Kondo temperatures decrease near QCP

Spin susceptibility is local at QCP

Logarithmic temperature dependence in specific heat and susceptibility

Abstract

We solve the 3D periodic Anderson model via two impurity DMFT. We obtain the temperature v.s. hybridization phase diagram. In approaching the quantum critical point (QCP) both the Neel and lattice Kondo temperatures decrease and they do not cross at the lowest temperature we reached. While strong ferromagnetic spin fluctuation on the Kondo side is observed, our result indicates the critical static spin susceptibility is local in space at the QCP. We observe in the crossover region logarithmic temperature dependence in the specific heat coefficient and spin susceptibility.