Interacting Antiferromagnetic Droplets in Quantum Critical CeCoIn_5

TL;DR

This paper investigates how doping with Cd in CeCoIn_5 induces local antiferromagnetic droplets that coexist with superconductivity, revealing insights into quantum critical behavior and local magnetic phenomena.

Contribution

It demonstrates the microscopic coexistence of antiferromagnetism and superconductivity and shows that magnetism emerges locally near dopants without altering low-frequency spin dynamics.

Findings

Microscopic coexistence of antiferromagnetism and superconductivity

Magnetism emerges locally around Cd dopants

No change in low-frequency spin dynamics in the disordered state

Abstract

The heavy fermion superconductor CeCoIn_5 can be tuned between superconducting and antiferromagnetic ground states by hole doping with Cd. Nuclear magnetic resonance (NMR) data indicate that these two orders coexist microscopically with an ordered moment ~0.7 \mu_B. As the ground state evolves, there is no change in the low frequency spin dynamics in the disordered state. These results suggest that the magnetism emerges locally in the vicinity of the Cd dopants.