Anomalous Hall effect and two-dimensional Fermi surfaces in the charge-density-wave state of kagome metal RbV\(_3\)Sb\(_5\)

• Published in: arXiv.org 2023-02
• Main Authors: Wang, Lingfei, Zhang, Wei, Wang, Zheyu, Tsz Fung Poon, Wang, Wenyan, Tsang, Chun Wai, Xie, Jianyu, Zhou, Xuefeng, Zhao, Yusheng, Wang, Shanmin, Kwing To Lai, Goh, Swee K
• Format: Article
• Language: English
• Subjects: Brillouin zones; Charge density waves; Electromagnetism; Fermi surfaces; Hall effect; Low temperature; Magnetoresistance; Magnetoresistivity; Signal to noise ratio; Single crystals
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2210.13250

AV\(_3\)Sb\(_5\) (A=Cs, K, Rb) are recently discovered superconducting systems (\(T_{\rm c}\sim0.9-2.5\) K) in which the vanadium atoms adopt the kagome structure. Intriguingly, these systems enter a charge-density-wave (CDW) phase (\(T_{\rm CDW}\sim80-100\) K), and further evidence shows that the time-reversal symmetry is broken in the CDW phase. Concurrently, the anomalous Hall effect 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 anomalous Hall effect in RbV\(_3\)Sb\(_5\) when the charge-density-wave state develops. The magnitude of anomalous Hall resistivity at 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 \(\sim\)56% of the Brillouin zone area, has been 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 anomalous Hall effect and band structure in kagome metals AV\(_3\)Sb\(_5\).