Reversible Tuning of the Heavy Fermion Ground State in CeCoIn$_5$

TL;DR

This paper demonstrates how minimal cadmium doping in CeCoIn$_5$ can reversibly tune its heavy-fermion ground state, revealing new insights into the interplay between superconductivity and antiferromagnetism.

Contribution

It introduces a reversible doping method to control the ground state in CeCoIn$_5$, expanding the experimental toolkit for heavy-fermion research.

Findings

Cadmium doping shifts the balance between superconductivity and antiferromagnetism.

Doping acts as an electronic tuning agent at ambient pressure.

New phase space for heavy-fermion ground states is revealed.

Abstract

Cadmium-doping the heavy-fermion superconductor CeCoIn$_5$ at the percent level acts as an electronic tuning agent, sensitively shifting the balance between superconductivity and antiferromagnetism and opening new ambient-pressure phase space in the study of heavy-fermion ground states.