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Dynamical decoding of the competition between charge density waves in a kagome superconductor
Honglie Ning1, Kyoung Hun Oh1, Yifan Su1
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Nature Communications
|August 23, 2024
Summary
Researchers used time-resolved X-ray diffraction to study charge density waves (CDW) in CsV3Sb5. They observed competition between two CDW phases, revealing distinct responses to light excitation and domain size changes.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Kagome superconductors like CsV3Sb5 exhibit complex charge density wave (CDW) phases.
- Understanding the interplay and competition between these CDW phases is crucial for explaining exotic electronic instabilities.
- Distinguishing between CDW phases with identical spatial periodicity using static methods is challenging.
Purpose of the Study:
- To investigate the out-of-equilibrium competition between coexisting 2×2×2 CDW phases in CsV3Sb5.
- To differentiate the dynamic responses of these CDW phases to photo-excitation.
- To establish a non-equilibrium framework for analyzing complex phase relationships.
Main Methods:
- Utilized time-resolved X-ray diffraction to probe CsV3Sb5.
- Analyzed light-induced changes in the intensity of CDW superlattice peaks.
- Examined peak width dynamics to infer domain size evolution.
Main Results:
- Demonstrated the presence of two distinct 2×2×2 CDW phases in CsV3Sb5.
- Observed differential melting of the two CDW phases upon photo-excitation.
- Showcased phase competition through light-induced domain growth in the more photo-resistant phase.
Conclusions:
- The study reveals the dynamic competition between multiple CDW phases in CsV3Sb5.
- Established time-resolved X-ray diffraction as a powerful tool for disentangling complex phase relationships.
- Provides a non-equilibrium approach to understanding exotic electronic phenomena in quantum materials.
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