Emergent states in heavy electron materials

TL;DR

This paper extends the two-fluid phenomenological theory of heavy electron behavior to include hybridization effectiveness, providing a comprehensive phase diagram and physical explanations for emergent states in Kondo lattice materials, validated by experimental data.

Contribution

The paper introduces an expanded two-fluid model incorporating hybridization effectiveness, offering a unified framework for understanding emergent states in heavy electron materials.

Findings

Good agreement with experimental data for CeRhIn_5 and other heavy electron materials.

Provides a new phase diagram explaining pressure-induced transitions.

Quantitatively describes the emergence of superconductivity and quantum criticality.

Abstract

We obtain the conditions necessary for the emergence of various low temperature ordered states (local moment antiferromagnetism, unconventional superconductivity, quantum criticality, and Landau Fermi liquid behavior) in Kondo lattice materials by extending the two-fluid phenomenological theory of heavy electron behavior to incorporate the concept of hybridization effectiveness. We use this expanded framework to present a new phase digram and consistent physical explanation and quantitative description of measured emergent behaviors such as the pressure variation of the onset of local moment antiferromagnetic ordering at T_N, the magnitude of the ordered moment, the growth of superconductivity within that ordered state, the location of a quantum critical point, and of a delocalization line in the pressure/temperature phase diagram at which local moments have disappeared and the heavy electron Fermi surface has grown to its maximum size. We apply our model to CeRhIn_5 and a number of other heavy electron materials and find good agreement with experiment.