Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

Siyu Cheng, Zheng Ren, Hong Li, Ji Seop Oh, Hengxin Tan, Ganesh Pokharel, Jonathan M. DeStefano, Elliott Rosenberg, Yucheng Guo, Yichen Zhang, Ziqin Yue, Yongbin Lee, Sergey Gorovikov, Marta Zonno, Makoto Hashimoto, Donghui Lu, Liqin Ke, Federico Mazzola, Junichiro Kono, R. J. BirgeneauJiun Haw Chu, Stephen D. Wilson, Ziqiang Wang, Binghai Yan, Ming Yi, Ilija Zeljkovic

Research output: Contribution to journalArticlepeer-review

Abstract

Charge density waves (CDWs) in kagome metals have been tied to many exotic phenomena. Here, using spectroscopic-imaging scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we study the charge order in kagome metal ScV6Sn6. The similarity of electronic band structures of ScV6Sn6 and TbV6Sn6 (where charge ordering is absent) suggests that charge ordering in ScV6Sn6 is unlikely to be primarily driven by Fermi surface nesting of the Van Hove singularities. In contrast to the CDW state of cousin kagome metals, we find no evidence supporting rotation symmetry breaking. Differential conductance dI/dV spectra show a partial gap Δ 1CO ≈ 20 meV at the Fermi level. Interestingly, dI/dV maps reveal that charge modulations exhibit an abrupt phase shift as a function of energy at energy much higher than Δ 1CO, which we attribute to another spectral gap. Our experiments reveal a distinctive nature of the charge order in ScV6Sn6 with fundamental differences compared to other kagome metals.

Original languageEnglish
Article number14
Journalnpj Quantum Materials
Volume9
Issue number1
DOIs
StatePublished - 27 Jan 2024

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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