Low-energy electronic structure in the unconventional charge-ordered state of ScV6Sn6

Asish K. Kundu, Xiong Huang, Eric Seewald, Ethan Ritz, Santanu Pakhira, Shuai Zhang, Dihao Sun, Simon Turkel, Sara Shabani, Turgut Yilmaz, Elio Vescovo, Cory R. Dean, David C. Johnston, Tonica Valla, Turan Birol, Dmitri N. Basov, Rafael M. Fernandes and Abhay N. Pasupathy ()
Additional contact information
Asish K. Kundu: Brookhaven National Laboratory
Xiong Huang: Columbia University
Eric Seewald: Columbia University
Ethan Ritz: University of Minnesota
Santanu Pakhira: Iowa State University
Shuai Zhang: Columbia University
Dihao Sun: Columbia University
Simon Turkel: Columbia University
Sara Shabani: Columbia University
Turgut Yilmaz: Brookhaven National Laboratory
Elio Vescovo: Brookhaven National Laboratory
Cory R. Dean: Columbia University
David C. Johnston: Iowa State University
Tonica Valla: Donostia International Physics Center (DIPC)
Turan Birol: University of Minnesota
Dmitri N. Basov: Columbia University
Rafael M. Fernandes: University of Minnesota
Abhay N. Pasupathy: Brookhaven National Laboratory

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Kagome vanadates AV3Sb5 display unusual low-temperature electronic properties including charge density waves (CDW), whose microscopic origin remains unsettled. Recently, CDW order has been discovered in a new material ScV6Sn6, providing an opportunity to explore whether the onset of CDW leads to unusual electronic properties. Here, we study this question using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM). The ARPES measurements show minimal changes to the electronic structure after the onset of CDW. However, STM quasiparticle interference (QPI) measurements show strong dispersing features related to the CDW ordering vectors. A plausible explanation is the presence of a strong momentum-dependent scattering potential peaked at the CDW wavevector, associated with the existence of competing CDW instabilities. Our STM results further indicate that the bands most affected by the CDW are near vHS, analogous to the case of AV3Sb5 despite very different CDW wavevectors.

Date: 2024
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DOI: 10.1038/s41467-024-48883-0

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