Understanding intertwined phases near quantum criticality is a central challenge in correlated electron systems. The kagome metal CsV3−xTixSb5 provides a fertile platform to investigate the interplay between charge-density-wave (CDW) and superconductivity. Here, combining x-ray diffraction (XRD) and scanning tunneling microscopy (STM), we uncover a dimensional evolution of the CDW upon Ti substitution. We find that even infinitesimal Ti doping (x = 0.009) completely suppresses the three-dimensional 2 × 2 × 4 CDW present in pristine CsV3Sb5, while reducing the remaining 2 × 2 × 2 CDW to a quasi-two-dimensional order. With further Ti substitution, although no CDW transition is discernible in resistivity measurements, our XRD and STM data reveal the emergence of a (quasi-)one-dimensional CDW with a short correlation length of ∼ 20 A˚ at x = 0.2. The stripelike CDW undergoes a continuous second-order phase transition, characterized by a gradual increase in intensity and correlation length below ∼ 56 K. Our results elucidate the dimensional evolution of CDW order in CsV3−xTixSb5 and provide new insight into understanding the unconventional CDWs and their role in kagome superconductors.
@article{arxiv.2601.09257,
title = {Evolution from three-dimensional charge density wave to one-dimensional stripe order in CsV$_{3-x}$Ti$_x$Sb$_5$},
author = {Qian Xiao and Xiangqi Liu and Zihao Huang and Xiquan Zheng and Shilong Zhang and Hui Chen and Hong-Jun Gao and Yanfeng Guo and Yingying Peng},
journal= {arXiv preprint arXiv:2601.09257},
year = {2026}
}