Evolution of charge bond order by Ti-doping in the kagome metals Cs(V_1-xTi_x)₃Sb₅ (0.00 ≤ x ≤ 0.05)

CsV₃Sb₅, a prototypical kagome metal, has attracted considerable attention in recent years. Despite substantial research efforts, the underlying mechanisms governing its multiple electronic orders and their interplay remain insufficiently elucidated. Of particular interest are the microscopic lattice modulations associated with charge bond order (CBO), which induce unique electronic band structures and profoundly influence the emergence and characteristics of other electronic orders, notably superconductivity. To investigate this unusual CBO, we performed temperature-dependent X-ray diffraction (XRD), specific heat, transport, and angle-resolved photoemission spectroscopy (ARPES) measurements on Cs(V₁₋ₓTiₓ)₃Sb₅ (x = 0.00-0.06) single crystals. Two distinct CBO transition temperatures, T_CBO1 and T_CBO2, were identified for x > 0.02, corresponding to anomalies in specific heat and transport measurements, respectively. T_CBO1 is observed to vanish near x ≈ 0.025, while T_CBO2 disappears around x ≈ 0.05. This establishes a Ti-doping-induced evolution of the CBO. Furthermore, XRD results identify a 2´2´2 lattice modulation and ARPES reveals band dispersion consistent with a staggered star-of-David (SoD) pattern in Cs(V_0.97Ti_0.03)₃Sb₅, pointing to stabilization of the new CBO for x = 0.02-0.05. We note that this is the first case of stabilizing staggered SoD patterns in AV₃Sb₅ systems, offering key insights on the CBO order evolution with Ti-doping in Cs(V₁₋ₓTiₓ)₃Sb₅.