Quantum-interference origin and magnitude of 1/f noise in Dirac nodal line IrO2 nanowires at low temperatures
Abstract
We present 1/f noise measurements of IrO2 nanowires from 1.7 to 350 K. Results reveal that the noise magnitude (represented by Hooge parameter γ) increases at low temperatures, indicating low-frequency resistance noise from universal conductance fluctuations. The cause of this noise is determined to be due to oxygen vacancies in the rutile structure of IrO2. Additionally, the number density of these mobile defects can be calculated from the T resistance rise caused by the orbital two-channel Kondo effect in the Dirac nodal line metal IrO2.
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