Tri-Hexagonal charge order in kagome metal CsV3Sb5 revealed by 121Sb NQR

作者：C. Mu, Q. Yin, Z. Tu, C. Gong, P. Zheng, H. Lei, Zheng Li, Jian-lin Luo · 发表于：Chinese Physics B · 年份：2021 · DOI：10.1088/1674-1056/ac422c · 被引用次数：12 · 研究领域：Physics

We report 121Sb nuclear quadrupole resonance (NQR) measurements on kagome superconductor CsV3Sb5 with T c = 2.5 K. 121Sb NQR spectra split after a charge density wave (CDW) transition at 94 K, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first order phase transition. The CDW order exhibits Tri-Hexagonal deformation with a lateral shift between the adjacent kagome layers, which is consistent with 2×2×2 superlattice modulation. The superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.