Journal Article

PUBDB-2025-01597

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fermi surface and effective masses of IrO$_2$ probed by de Haas-van Alphen quantum oscillations

Götze, K.DESY* ; Pearce, M. ; Negi, S. ; Soh, J.-R. ; Prabhakaran, D.Extern* ; Goddard, P. (Corresponding author)

2025
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/b1sg-8gps  doi:10.3204/PUBDB-2025-01597

Abstract: Iridium-containing conducting materials are widely investigated for their strong spin-orbit couplingand potential topological properties. Recently the commonly used electrode material iridiumdioxide 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 IrO$_2$ single crystals using the de Haas-van Alphen effect measured using torque magnetometry with a piezo-resistive microcantileveras well as density functional theory-based band-structure calculations. The angle, temperature andfield dependencies of the oscillations and the band dispersion provide valuable information on theproperties 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-vanAlphen frequencies to the calculated Fermi surface topology. We find that the effective masses of IrO$_2$ are enhanced compared to the rest electron mass me, ranging from 1.9 to 3.0 me, whereasthe 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 IrO$_2$ and comparethe effective masses and other electronic properties to those of similar materials like the nodal chainmetal ReO$_2$ in which Dirac electrons with very light effective masses have been observed.

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Contributing Institute(s):

1. FS-Undulator Systeme (FS-US)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. ExtremeQuantum - Quantum materials under extreme conditions (681260) (681260)

Experiment(s):

1. Measurement at external facility
2. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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