Abstract
The heavy fermion superconductor CeCoIn5 can be tuned between superconducting and antiferromagnetic ground states by hole doping with Cd. Nuclear magnetic resonance data indicate that these two orders coexist microscopically with an ordered moment approximately 0.7 microB. 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.
Highlights
The heavy fermion superconductor CeCoIn5 can be tuned between superconducting and antiferromagnetic ground states by hole doping with Cd
As the ground state evolves, there is no change in the low-frequency spin dynamics in the disordered state
CeCoIn5 is interesting as it has the highest Tc for a Cebased heavy fermion superconductor, and the normal state exhibits non-Fermi liquid behavior that may be associated with a quantum critical point (QCP) [2]
Summary
The heavy fermion superconductor CeCoIn5 can be tuned between superconducting and antiferromagnetic ground states by hole doping with Cd. Nuclear magnetic resonance data indicate that these two orders coexist microscopically with an ordered moment 0:7B. As the Fermi surface evolves with hole doping, either superconductivity or antiferromagnetism may emerge, depending on the quantity JN 0 in much the same way that pressure changes the ground state by modifying J [1].
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