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Kondo screening in a Majorana metal
1Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang, 37673, Republic of Korea.
Nature Communications
|November 17, 2023
Summary
Researchers observed metallic Kondo screening in alpha-RuCl3 using chromium impurities. This indicates a Majorana metal host, opening new avenues for quantum magnet research.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Materials Science
Background:
- Kondo impurities are crucial for probing quantum spin liquid excitations.
- In the S=1/2 Kitaev model, impurities can be screened by Majorana fermions.
- Understanding impurity screening in quantum magnets is key to exploring exotic electronic states.
Purpose of the Study:
- To experimentally investigate Kondo screening in the Kitaev honeycomb material alpha-RuCl3.
- To identify signatures of metallic-like Kondo screening at intermediate temperatures.
- To explore the presence of a host Majorana metal through impurity interactions.
Main Methods:
- Utilizing dilute Cr3+ (S=3/2) impurities in alpha-RuCl3.
- Measuring static magnetic susceptibility.
- Performing muon Knight shift and muon spin-relaxation rate measurements.
- Analyzing the magnetic specific heat's linear coefficient.
Main Results:
- Observed logarithmic divergences in magnetic susceptibility, muon Knight shift, and relaxation rate, characteristic of a metallic Kondo effect.
- Found a large linear coefficient of magnetic specific heat at intermediate temperatures.
- Provided experimental evidence for metallic-like Kondo screening in alpha-RuCl3 with Cr3+ impurities.
Conclusions:
- The experimental results demonstrate metallic-like Kondo screening in alpha-RuCl3, mediated by Majorana fermions.
- The findings suggest the presence of a host Majorana metal, offering a new platform for studying Kondo physics in insulating quantum magnets.
- This research opens up new avenues for exploring uncharted Kondo physics in complex quantum magnetic systems.
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