Anomalous Hall effect and two-dimensional Fermi surfaces in the charge-density-wave state of kagome metal RbV 3 Sb 5

作者：Lingfei Wang, Wei Zhang, Zheyu Wang, Tsz Fung Poon, Wenyan Wang, Chun Wai Tsang, Jianyu Xie, Xuefeng Zhou, Yusheng Zhao, Shanmin Wang, Kwing To Lai, Swee K. Goh · 发表于：Journal of Physics Materials · 年份：2023 · DOI：10.1088/2515-7639/acba46 · 被引用次数：22 · 研究领域：Topological Materials and Phenomena、Advanced Condensed Matter Physics、Quantum, superfluid, helium dynamics

Abstract AV 3 Sb 5 (A = Cs, K, Rb) is a recently discovered superconducting system ( T c ∼ 0.9 –2.5 K) in which the vanadium atoms adopt the kagome structure. Intriguingly, these systems enter a charge-density-wave (CDW) phase ( T C D W ∼ 80 –100 K), and further evidence shows that the time-reversal symmetry is broken in the CDW phase. Concurrently, the anomalous Hall effect (AHE) has been observed in KV 3 Sb 5 and CsV 3 Sb 5 inside the novel CDW phase. Here, we report a comprehensive study of a high-quality RbV 3 Sb 5 single crystal with magnetotransport measurements. Our data demonstrate the emergence of the AHE in RbV 3 Sb 5 when the CDW state develops. The magnitude of the anomalous Hall resistivity in the low temperature limit is comparable to the reported values in KV 3 Sb 5 and CsV 3 Sb 5 . The magnetoresistance channel further reveals a rich spectrum of quantum oscillation frequencies, many of which have not been reported before. In particular, a large quantum oscillation frequency (2235 T), which occupies ∼56% of the Brillouin zone area, was recorded. For the quantum oscillation frequencies with sufficient signal-to-noise ratio, we further perform field angle-dependent measurements, and our data indicate two-dimensional Fermi surfaces in RbV 3 Sb 5 . Our results provide indispensable information for understanding the AHE and band structure in kagome metal AV 3 Sb 5 .