In the kagome superconductor CsV₃Sb₅, superconductivity is intertwined with an unconventional charge density wave and the pairing symmetry remains unclear due to the absence of direct superconducting gap measurements. Here, the authors use laser-based ultra-high-resolution angle-resolved photoemission spectroscopy to reveal a highly anisotropic superconducting gap on the Fermi surface originating from the 3d-orbital electrons of the vanadium sublattice, providing insights into the physics of intertwined orders in kagome superconductors.
- Akifumi Mine
- Yigui Zhong
- Kozo Okazaki