Nontrivial Fermi surface topology of the kagome superconductor CsV3Sb5 probed by de Haas–van Alphen oscillations

K. Shrestha, R. Chapai, Bal K. Pokharel, D. Miertschin, T. Nguyen, X. Zhou, D. Y. Chung, M. G. Kanatzidis, J. F. Mitchell, U. Welp, Dragana Popović, D. E. Graf, B. Lorenz, and W. K. Kwok
Phys. Rev. B 105, 024508 – Published 10 January 2022
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Abstract

We have investigated the normal state Fermi-surface properties of the kagome superconductor CsV3Sb5 using torque magnetometry with applied fields (H) up to 35 T. The torque signal shows clear de Haas–van Alphen (dHvA) oscillations above 15 T. The oscillations are smooth and consist of seven distinct frequencies with values from 18 T to 2135 T. The presence of higher frequencies in CsV3Sb5 is further confirmed by carrying out additional measurements using the tunnel diode oscillator technique. All frequencies measured at different tilt angles (θ) of the field direction with respect to the c axis show a 1/cosθ dependence, implying that the Fermi surfaces corresponding to these frequencies are two dimensional (2D). The absence of dHvA oscillations at θ = 90o further supports the presence of 2D Fermi surfaces. The Berry phase (ϕ) determined from the Landau level fan diagram for all frequencies is 0.4. This value is close to the theoretical value of ϕ = 0.5 for a nontrivial system, which strongly supports the nontrivial topology of the Fermi surfaces of these frequencies. Several quantities characterizing the Fermi surface are calculated employing the Lifshitz-Kosevich theory. These findings are crucial for exploring the interplay between nontrivial band topology, charge-density wave, and unconventional superconductivity of CsV3Sb5.

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  • Received 12 October 2021
  • Accepted 21 December 2021

DOI:https://doi.org/10.1103/PhysRevB.105.024508

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Shrestha1,*,†, R. Chapai2,†, Bal K. Pokharel3,4, D. Miertschin1, T. Nguyen1, X. Zhou2, D. Y. Chung2, M. G. Kanatzidis2,5, J. F. Mitchell2, U. Welp2, Dragana Popović3,4, D. E. Graf3,4, B. Lorenz6, and W. K. Kwok2

  • 1Department of Chemistry and Physics, West Texas A&M University, Canyon, Texas 79016, USA
  • 2Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 3Department of Physics, Florida State University, Tallahassee, Florida, 32306, USA
  • 4National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 5Department of Chemistry, Northwestern University, Evanston, Illinois 60201, USA
  • 6Texas Center for Superconductivity and Department of Physics, University of Houston, 3369 Cullen Boulevard, Houston, Texas 77204, USA

  • *Corresponding author: kshrestha@wtamu.edu
  • These authors contributed equally to this work.

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Issue

Vol. 105, Iss. 2 — 1 January 2022

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