Kagome metals AV₃Sb₅ (A= Cs, K, and Rb) have gained significant attention due to their exotic properties, such as charge density wave (CDW) order, superconductivity, and electronic structure characterized by flat bands, Dirac points, and saddle points [1, 2]. CsV₃Sb₅ has been recognized as a particularly rich system, displaying an atomic and electronic chirality below the charge density wave transition [3] in addition to CDW order and superconductivity.

Isovalent substitution of Nb suppresses the CDW transition temperature and increases the energy gaps at the Dirac points but enhances superconductivity compared to the pristine compound [4]. Conversely, electron substitution via Cr substitution at the V site monotonically suppresses both superconductivity and CDW order [5]. We investigated changes in the local atomic structure of Cr-substituted CsV₃Sb₅ across the transition to a CDW ordered state. I will discuss the emergence of the chiral atomic structure of Cr-doped CsV₃Sb₅ in the CDW phase, as determined by hard x-ray photoelectron diffraction (XPD) in momentum microscopy measurements.

Reference:

[1] Stephen D. Wilson, Brenden R. Ortiz, AV₃Sb₅ kagome superconductors, Nature Reviews Materials 9, 420–432 (2024)

[2] Brenden R. Ortiz et al., New kagome prototype materials: discovery of KV₃Sb₅, RbV₃Sb₅, and CsV₃Sb₅, Phys. Rev. Materials 3, 094407 (2019)

[3] H. J. Elmers et al., Chirality in the Kagome Metal CsV₃Sb₅, Phys. Rev. Lett. 134, 096401 (2025)

[4] H. J. Elmers et al., Orbital magnetization in the Nb-substituted kagome metal CsV₃Sb₅, Phys. Rev. B 112, 245109 (2025)

[5] Shuto Suzuki et al., Evolution of band structure in the kagome superconductor Cs(V_1−𝑥Cr_𝑥)₃Sb₅: Toward universal understanding of charge density wave and superconducting phase diagrams, Phys. Rev. B 110, 165104 (2024)