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Physical Sciences › Physics and Astronomy › Condensed Matter Physics
Time-reversal symmetry-breaking charge order in a kagome superconductor
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Paper Summary
Paperzilla title
Muon Spin Relaxation Reveals Time-Breaking Charge Order in Kagome Superconductor!
This study uses muon spin relaxation to demonstrate time-reversal symmetry breaking associated with charge order in the kagome superconductor KV3Sb5. This charge order enhances the internal magnetic field width sensed by muons and persists into the superconducting state, which itself exhibits a multi-gap nature with a Tc/λab ratio comparable to unconventional high-temperature superconductors.
Possible Conflicts of Interest
None identified
Identified Weaknesses
Limited low-temperature data
The lack of data points below 0.25 K makes it challenging to differentiate between the s+s-wave and s+f-wave models and to estimate the zero-temperature value of penetration depth.
Reliance on theoretical modeling
The analysis is based on theoretical modeling and lacks direct experimental confirmation of the specific order of orbital currents.
Uncertain nature of two-step behavior
While the study observes a two-step behavior in penetration depth, indicative of multi-gap superconductivity, the precise nature and origin of this behavior require further investigation.
Discrepancy in susceptibility measurements
The difference in temperature dependence between the muon Knight shift and macroscopic susceptibility within the charge-ordered state needs further clarification.
Rating Explanation
This study presents strong evidence for time-reversal symmetry breaking in KV3Sb5 using muon spin relaxation, revealing an intriguing interplay between charge order and superconductivity. The comprehensive analysis and combination of multiple experimental techniques solidify the findings. However, some uncertainties regarding the nature of the two-step penetration depth behavior and the need for further theoretical refinement limit the rating to 4.
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Original Title:
Time-reversal symmetry-breaking charge order in a kagome superconductor
File Name:
2106.13443.pdf
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File Size:
3.68 MB
Uploaded:
July 14, 2025 at 05:25 PM
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