Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39622808.
- Also identified by DOI 10.1038/s41467-024-53737-w and PMC identifier 11612471.
- Licence recorded as CC BY-NC-ND.
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Abstract
Tunable quantum materials hold great potential for applications. Of special interest are materials in which small lattice strain induces giant electronic responses. The kagome compounds AV<sub>3</sub>Sb<sub>5</sub> (A = K, Rb, Cs) provide a testbed for electronic tunable states. In this study, through angle-resolved photoemission spectroscopy, we provide comprehensive spectroscopic measurements of the electronic responses induced by compressive and tensile strains on the charge-density-wave (CDW) and van Hove singularity (VHS) in CsV<sub>3</sub>Sb<sub>5</sub>. We observe a tripling of the CDW gap magnitudes with ~ 1% strain. Simultaneously, changes of both energy and mass of the VHS are observed. Combined, this reveals an anticorrelation between the unconventional CDW order parameter and the mass of the VHS, and highlight the role of the latter in the superconducting pairing. The substantial electronic responses uncover a rich strain tunability of the versatile kagome system in studying quantum interplays under lattice variations.