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Evidence for time-reversal symmetry-breaking kagome superconductivity
Hanbin Deng1, Guowei Liu1, Z Guguchia2
1Department of Physics, Southern University of Science and Technology, Shenzhen, China.
Nature Materials
|August 28, 2024
Summary
Researchers found time-reversal symmetry-breaking superconductivity in a kagome metal, where magnetism influences Cooper pairing. This discovery reveals intertwined superconductivity and magnetism in quantum materials.
Area of Science:
- Quantum Matter Physics
- Condensed Matter Physics
- Materials Science
Background:
- Superconductivity and magnetism are typically opposing phenomena in quantum materials.
- Their interplay is theoretically predicted in frustrated-lattice systems.
Purpose of the Study:
- To investigate the coexistence and interplay of superconductivity and magnetism in the kagome metal Cs(V, Ta)3Sb5.
- To demonstrate time-reversal symmetry-breaking superconductivity modulated by magnetism.
Main Methods:
- Utilized scanning tunnelling microscopy (STM).
- Employed muon spin resonance (µSR).
Main Results:
- Demonstrated time-reversal symmetry-breaking superconductivity in Cs(V, Ta)3Sb5.
- Observed spontaneous internal magnetism within a fully gapped superconducting state.
- Detected time-reversal asymmetrical interference of Bogoliubov quasi-particles under magnetic field perturbation, indicating spontaneous pairing gap modulation.
Conclusions:
- The findings provide experimental evidence for intertwined magnetism and time-reversal symmetry-breaking superconductivity in kagome metals.
- The observed phenomena align with theoretical proposals for unusual interference effects in such systems.
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