Evolution of charge correlations in CsV₃Sb_5-x Sn_x studied via synchrotron x-ray diffraction

The kagome metal CsV₃Sb₅ hosts a complex charge density wave state that is proposed to intertwined with its lower temperature superconducting phase in a nontrivial manner. Of particular interest is the relationship between charge correlations and the stability of the superconducting state in this material. The behavior of the charge density wave (CDW) state can be studied via synchrotron x-ray scattering measurements, as the CDW manifests as a structural distortion at around 94K in the parent structure in the form of 2x2x4, 2x2x2, and 2x2x1 superstructures. Furthermore, the CsV₃Sb₅ structure allows for chemical doping of holes via Sn atoms onto the Sb sites, exhibiting a suppression of the charge density wave at small hole-doping levels and a double-dome type superconducting phase diagram with increasing Sn doping. In our study, we probe the evolution of charge correlations as a function of hole-doping in CsV₃Sb₅ via synchrotron x-ray diffraction measurements. With increasing Sn doping in CsV₃Sb_5-xSn_X, the 2x2x4 distortion is suppressed, giving rise to short-range correlations that further weaken at higher doping levels. The creation of intermediate incommensurate charge correlations and eventual formation of quasi-1D charge correlations is discussed.