Large Fermi surface in pristine kagome metal CsV3Sb5 and enhanced quasiparticle effective masses

• 成果类型: Article
• 署名作者: Zhang, Wei; Poon, Tsz Fung; Tsang, Chun Wai; Wang, Wenyan; Liu, X.; Xie, J.; Lam, S. T.; Wang, Shanmin; Lai, Kwing To; Pourret, A.; Seyfarth, G.; Knebel, G.; Yu, Wing Chi; Goh, Swee K.
• 署名单位: Chinese University of Hong Kong; Southern University of Science & Technology; Chinese University of Hong Kong; CUHK Shenzhen Research Institute; Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Institut National Polytechnique de Grenoble; Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Universite de Toulouse; Universite Toulouse III - Paul Sabatier; Communaute Universite Grenoble Alpes; Universite Grenoble Alpes (UGA); Universite Federale Toulouse Midi-Pyrenees (ComUE); Institut National des Sciences Appliquees de Toulouse; Centre National de la Recherche Scientifique (CNRS); City University of Hong Kong
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12113
• DOI: 10.1073/pnas.2322270121
• 发表日期: 2024-05-21
• 关键词: pressure; state

摘要

The kagome metal CsV3Sb5 is an ideal platform to study the interplay between topology and electron correlation. To understand the fermiology of CsV3Sb5, intensive quantum oscillation (QO) studies at ambient pressure have been conducted. However, due to the Fermi surface reconstruction by the complicated charge density wave (CDW) order, the QO spectrum is exceedingly complex, hindering a complete understanding of the fermiology. Here, we directly map the Fermi surface of the pristine CsV3Sb5 by measuring Shubnikov-de Haas QOs up to 29 T under pressure, where the CDW order is completely suppressed. The QO spectrum of the pristine CsV3Sb5 is significantly simpler than the one in the CDW phase, and the detected oscillation frequencies agree well with our density functional theory calculations. In particular, a frequency as large as 8,200 T is detected. Pressure-dependent QO studies further reveal a weak but noticeable enhancement of the quasiparticle effective masses on approaching the critical pressure where the CDW order disappears, hinting at the presence of quantum fluctuations. Our high-pressure QO results reveal the large, unreconstructed Fermi surface of CsV3Sb5, paving the way to understanding the parent state of this intriguing metal in which the electrons can be organized into different ordered states.