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Zhang W, Poon TF, Tsang CW, Wang W, Liu X, Xie J, Lam ST, Wang S, Lai KT, Pourret A, Seyfarth G, Knebel G, Yu WC, Goh SK. Large Fermi surface in pristine kagome metal CsV 3Sb 5 and enhanced quasiparticle effective masses. Proc Natl Acad Sci U S A 2024; 121:e2322270121. [PMID: 38753515 PMCID: PMC11127005 DOI: 10.1073/pnas.2322270121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 04/17/2024] [Indexed: 05/18/2024] Open
Abstract
The kagome metal CsV[Formula: see text]Sb[Formula: see text] is an ideal platform to study the interplay between topology and electron correlation. To understand the fermiology of CsV[Formula: see text]Sb[Formula: see text], 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 CsV[Formula: see text]Sb[Formula: see text] 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 CsV[Formula: see text]Sb[Formula: see text] 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 CsV[Formula: see text]Sb[Formula: see text], paving the way to understanding the parent state of this intriguing metal in which the electrons can be organized into different ordered states.
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Affiliation(s)
- Wei Zhang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Tsz Fung Poon
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Chun Wai Tsang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Wenyan Wang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - X. Liu
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - J. Xie
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - S. T. Lam
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Shanmin Wang
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong518005, China
| | - Kwing To Lai
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - A. Pourret
- Université Grenoble Alpes, Commissariat à l’énergie atomique et aux énergies alternatives, Institut polytechnique de Grenoble, Institut de recherche interdisciplinaire de Grenoble, Laboratoire Photonique Electronique et Ingénierie Quantiques, Grenoble38000, France
| | - G. Seyfarth
- Laboratoire National des Champs Magnétiques Intenses, Université Grenoble Alpes, Grenoble38000, France
- Laboratoire National des Champs Magnétiques Intenses, Centre National de la Recherche Scientifique, Université Paul Sabatier Toulouse 3, Institut National des Sciences Appliquées Toulouse, European Magnetic Field Laboratory, Grenoble38000, France
| | - G. Knebel
- Université Grenoble Alpes, Commissariat à l’énergie atomique et aux énergies alternatives, Institut polytechnique de Grenoble, Institut de recherche interdisciplinaire de Grenoble, Laboratoire Photonique Electronique et Ingénierie Quantiques, Grenoble38000, France
| | - Wing Chi Yu
- Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Swee K. Goh
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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Zheng G, Zhu Y, Mozaffari S, Mao N, Chen KW, Jenkins K, Zhang D, Chan A, Arachchige HWS, Madhogaria RP, Cothrine M, Meier WR, Zhang Y, Mandrus D, Li L. Quantum oscillations evidence for topological bands in kagome metal ScV 6Sn 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:215501. [PMID: 38335546 DOI: 10.1088/1361-648x/ad2803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 02/09/2024] [Indexed: 02/12/2024]
Abstract
Metals with kagome lattice provide bulk materials to host both the flat-band and Dirac electronic dispersions. A new family of kagome metals is recently discovered inAV6Sn6. The Dirac electronic structures of this material needs more experimental evidence to confirm. In the manuscript, we investigate this problem by resolving the quantum oscillations in both electrical transport and magnetization in ScV6Sn6. The revealed orbits are consistent with the electronic band structure models. Furthermore, the Berry phase of a dominating orbit is revealed to be aroundπ, providing direct evidence for the topological band structure, which is consistent with calculations. Our results demonstrate a rich physics and shed light on the correlated topological ground state of this kagome metal.
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Affiliation(s)
- Guoxin Zheng
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Yuan Zhu
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Shirin Mozaffari
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
| | - Ning Mao
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Kuan-Wen Chen
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Kaila Jenkins
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Dechen Zhang
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Aaron Chan
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Hasitha W Suriya Arachchige
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
| | - Richa P Madhogaria
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
| | - Matthew Cothrine
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
| | - William R Meier
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
| | - Yang Zhang
- Department of Physics and Astronomy, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
- Min H. Kao Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996, United States of America
| | - David Mandrus
- Materials Science and Engineering Department, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
- Department of Physics and Astronomy, University of Tennessee Knoxville, Knoxville, TN 37996, United States of America
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America
| | - Lu Li
- Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States of America
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