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Time-dependent universal conductance fluctuations in IrO2 nanowires

Yong-Han Lin1, Lu-Yao Wang2* and Juhn-Jong Lin13*

Author Affiliations

1 Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan

2 Department of Physics, Fu Jen Catholic University, Hsinchuang 24205, Taiwan

3 Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan

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Nanoscale Research Letters 2012, 7:673  doi:10.1186/1556-276X-7-673

Published: 13 December 2012


Single-crystalline iridium dioxide nanowires show the time-dependent universal conductance fluctuations (TUCFs) at cryogenic temperatures. The conductance fluctuations persist up to temperature T as high as nearly 10 K. The root-mean-square TUCF magnitudes increase with decreasing T, reaching approximately 0.1 e2 / h at 1.7 K. We ascribe these conductance fluctuations to originating from the conduction electrons scattering upon mobile defects (moving scattering centers). Our measured TUCF characteristics are satisfactorily explained in terms of the existing TUCF theory in its three-dimensional form. The extracted electron dephasing length Lφ(1.7 K) ≃90 nm is smaller than the diameter (≈ 180 nm) of our nanowires.

Quantum-interference effect; Universal conductance fluctuation; Mobile defect; Iridium dioxide nanowire; Rutile structure