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Realization of Kagome Kondo lattice
Boqin Song1, Yuyang Xie1,2, Wei-Jian Li3
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Nature Communications
|July 2, 2025
Summary
Researchers discovered CsCr6Sb6, a novel Kagome Kondo lattice material. This finding enables exploration of exotic quantum phenomena in strongly correlated frustrated systems.
Area of Science:
- Condensed matter physics
- Quantum magnetism
- Materials science
Background:
- The Kondo lattice model describes interactions between local magnetic moments and itinerant electrons, crucial for strongly correlated states.
- Kagome lattices are theoretically predicted to exhibit unique Kondo physics, magnetism, and topology, but experimental evidence has been lacking.
Purpose of the Study:
- To experimentally realize and investigate Kondo physics in a Kagome lattice system.
- To explore the properties of a novel van der Waals-like Kagome Kondo lattice material.
Main Methods:
- Synthesis and characterization of CsCr6Sb6 single crystals.
- Transport measurements to probe electronic properties.
- Magnetic susceptibility and Hall effect measurements.
Main Results:
- Discovery of CsCr6Sb6, a van der Waals-like Kagome Kondo lattice with flat, isolated Cr-3d bands at the Fermi level.
- Observation of heavy fermions with effective masses over 100 times larger than vanadium counterparts.
- Kondo insulating behavior at ultra-low carrier densities (10^19 cm^-3) and dimensionality-induced Kondo breakdown.
- Unveiling of hidden A-type antiferromagnetism and an anomalous Hall effect dependent on layer parity in exfoliated samples.
Conclusions:
- CsCr6Sb6 represents the first experimental realization of Kondo physics in a Kagome lattice.
- The material's unique electronic structure and magnetic properties open new avenues for studying quantum criticality in frustrated systems.
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