Superconductivity under pressure in a chromium-based kagome metal
Yi Liu1,2, Zi-Yi Liu3,4, Jin-Ke Bao5,6
1School of Physics, Zhejiang University, Hangzhou, China.
Nature
|August 28, 2024
Summary
Researchers discovered a new chromium-based kagome metal, CsCr3Sb5, exhibiting strong correlations and magnetism. This material shows superconductivity under pressure, offering a new platform for studying exotic phenomena in correlated kagome systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Superconductivity in correlated kagome systems is theoretically predicted but experimentally elusive.
- Existing vanadium-based kagome materials are nonmagnetic and weakly correlated, limiting their potential for exotic superconductivity.
Purpose of the Study:
- To discover and characterize a novel kagome material that exhibits strong electron correlations and magnetism.
- To investigate the interplay between magnetism, density-wave orders, and superconductivity in this new material under pressure.
Main Methods:
- Synthesis and characterization of the chromium-based kagome metal CsCr3Sb5.
- High-pressure studies including structural, magnetic, and transport measurements.
- Analysis of phase transitions and superconducting properties.
Main Results:
- Discovery of CsCr3Sb5, a strongly correlated, magnetic kagome metal with flat bands.
- Observation of concurrent structural and magnetic phase transitions at ambient pressure.
- Suppression of density-wave orders under pressure, leading to the emergence of a superconducting dome (3.65-8.0 GPa) with a maximum Tc of 6.4 K.
- Normal state exhibiting non-Fermi-liquid behavior near the superconducting dome.
Conclusions:
- CsCr3Sb5 provides a unique experimental platform for exploring superconductivity in correlated kagome systems.
- The interplay between magnetism, density-wave orders, and unconventional superconductivity is highlighted.
- The findings pave the way for future research into quantum criticality and exotic electronic phases in kagome materials.
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