Interplay between charge correlations and superconductivity across the superconducting domes of
Phys. Rev. B 114, 094504 – Published 10 August, 2026
DOI: https://doi.org/10.1103/bcqw-7lsf
Abstract
The kagome metal hosts an anomalous interplay between charge density wave (CDW) order and superconductivity—one where tuning its band filling by adding holes rapidly suppresses long-range CDW order and drives the formation of two unusual superconducting “domes.” Here, we determine the detailed evolution of charge correlations across the two domes of hole-doped and resolve their interplay with the superconducting state. Upon light hole doping, the suppression of a metastable CDW state coincides with quenching superconducting fluctuations present in the parent compound. Continued doping suppresses long-range CDW order, leaving remnant short-range correlations that persist across the second superconducting dome. These remnant correlations present in a quasi-one-dimensional correlation volume with a central wave vector approaching a single--point instability, whose stabilization is captured in ab initio models. The microscopic nature of the competing single- CDW is resolved as short-range V-V dimers, which break rotational and translational symmetry locally throughout the second superconducting dome and whose presence coincides with a superconducting ground state.