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Fermi surface and effective masses of IrO2 probed by de Haas-van Alphen quantum oscillations

K. Götze1,2, M. J. Pearce2,*, S. Negi3, J.-R. Soh4, D. Prabhakaran5, and P. A. Goddard2,†

  • *Present address: Department of Physics, Durham University, Durham DH1 3LE, United Kingdom.
  • †Contact author: p.goddard@warwick.ac.uk
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Phys. Rev. Materials 9, 104201 – Published 1 October, 2025

DOI: https://doi.org/10.1103/b1sg-8gps

Abstract

Iridium-containing conducting materials are widely investigated for their strong spin-orbit coupling and potential topological properties. Recently the commonly used electrode material iridium dioxide was found to host a large spin-Hall conductivity and was shown to support Dirac nodal lines. Here we present quantum-oscillation experiments on high-quality IrO2 single crystals using the de Haas-van Alphen effect measured using torque magnetometry with a piezoresistive microcantilever as well as density functional theory-based band-structure calculations. The angle, temperature, and field dependencies of the oscillations and the calculated band dispersion provide valuable information on the properties of the charge carriers, including the Fermi-surface geometry and electronic correlations. Comparison of experimental results to calculations allows us to assigns the observed de Haas-van Alphen frequencies to the calculated Fermi surface topology. We find that the effective masses of IrO2 are enhanced compared to the rest electron mass me, ranging from 1.9 to 3.0 me, whereas the scattering times indicate excellent sample quality. We discuss our results in context with recent ARPES and band-structure calculation results that found Dirac nodal lines in IrO2 and compare the effective masses and other electronic properties to those of similar materials like the nodal chain metal ReO2 in which Dirac electrons with very light effective masses have been observed.

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Phys. Rev. Materials 9, 104201– Published 1 October, 2025
  • Received 21 May 2025
  • Accepted 4 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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