The authors present ARPES and STM/STS measurements of the kagome superconductor CsV3-xTaxSb5. For the x = 0.4 Ta-doped sample, they report evidence for a van Hove singularity perfectly aligned with the Fermi level, and that the superconducting transition temperature is maximized at this doping.
- Yang Luo
- Yulei Han
- Junfeng He
