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Interacting antiferromagnetic droplets in quantum critical CeCoIn5
R R Urbano1, B-L Young, N J Curro
1Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Physical Review Letters
|October 13, 2007
Summary
Hole doping heavy fermion superconductor CeCoIn5 with Cd reveals that superconductivity and antiferromagnetism coexist. Magnetism appears localized near Cd dopants, without altering spin dynamics in the disordered state.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Heavy fermion superconductors like CeCoIn5 exhibit complex phase diagrams.
- Tuning material properties can lead to competing ground states, such as superconductivity and antiferromagnetism.
- Understanding the interplay between different electronic orders is crucial for novel material design.
Purpose of the Study:
- Investigate the ground states of CeCoIn5 tuned by cadmium (Cd) hole doping.
- Determine the coexistence and spatial relationship between superconducting and antiferromagnetic orders.
- Analyze the impact of doping on low-frequency spin dynamics.
Main Methods:
- Utilized nuclear magnetic resonance (NMR) spectroscopy.
- Employed hole doping with cadmium (Cd) to tune the electronic properties of CeCoIn5.
- Analyzed the evolution of magnetic order and spin dynamics.
Main Results:
- Observed microscopic coexistence of superconducting and antiferromagnetic orders.
- Quantified an ordered magnetic moment of approximately 0.7 microB.
- Found no change in low-frequency spin dynamics within the disordered state as the ground state evolved.
- Indicated that magnetism emerges locally around Cd dopants.
Conclusions:
- The study demonstrates that superconductivity and antiferromagnetism can coexist microscopically in CeCoIn5.
- Evidence suggests that magnetic order is induced locally by Cd dopants.
- The findings provide insights into the complex interplay of competing orders in heavy fermion systems.
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