Remarkable suppression of lattice thermal conductivity by electron-phonon scattering in iridium dioxide nanowires

Tao, Yi; Pan, Zhidong; Ruch, Thomas; Zhan, Xun; Chen, Y.; Zhang, S.X.; Li, Deyu

doi:10.1016/j.mtphys.2021.100517

Cited by 6 publications

(19 citation statements)

References 76 publications

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“…For the undoped case, the 75 nm diameter nanowire has a higher resistivity than the 126 nm nanowire, which was attributed to the enhanced surface scattering of electrons and possibly a varied density of point defects. [32] The five measured Ir 1 − x V x O 2 nanowires have diameters varying from 87 to 149 nm with resistivities that follow the same diameter dependence observed in the undoped nanowires, with the exception of the 143 nm wire (inset of Figure 3c). The diameter dependence again suggests that surface boundary scattering plays a role in charge transport.…”

Section: Resultssupporting

confidence: 57%

“…[81] In brief, each oxygen vacancy can lead to a two-fold degeneracy of the d xz and d yz orbitals around the nearest Ir ions. Such a degeneracy drives the orbital 2CK effect where the degenerate orbitals form a local pseudospin basis and the spin states [32] of the conduction electrons act as a channel index. [81] The 2CK is associated with strong electron correlation and manifests by a √ T dependence of resistivity increase upon cooling.…”

Section: Resultsmentioning

confidence: 99%

“…This large lattice contribution arises from the strong interatomic bonding and large atomic mass difference between iridium and oxygen, which competes with the suppression induced by strong electron-phonon interactions. [32] Beyond fundamental studies, IrO 2 has technological importance in various areas including water splitting, [33,34] ferroelectric memories, [35] and electrochemical devices. [30,36] In this work, we doped weakly-interacting IrO 2 nanowires with 3d transition metal vanadium to enhance electron correlations in this spin-orbit coupled system.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Electron Correlation and Significantly Suppressed Thermal Conductivity in Dirac Nodal‐Line Metal Nanowires by Chemical Doping

et al. 2022

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Enhancing electron correlation in a weakly interacting topological system has great potential to promote correlated topological states of matter with extraordinary quantum properties. Here, the enhancement of electron correlation in a prototypical topological metal, namely iridium dioxide (IrO2), via doping with 3d transition metal vanadium is demonstrated. Single‐crystalline vanadium‐doped IrO2 nanowires are synthesized through chemical vapor deposition where the nanowire yield and morphology are improved by creating rough surfaces on substrates. Vanadium doping leads to a dramatic decrease in Raman intensity without notable peak broadening, signifying the enhancement of electron correlation. The enhanced electron correlation is further evidenced by transport studies where the electrical resistivity is greatly increased and follows an unusual T$\sqrt T $ dependence on the temperature (T). The lattice thermal conductivity is suppressed by an order of magnitude via doping even at room temperature where phonon‐impurity scattering becomes less important. Density functional theory calculations suggest that the remarkable reduction of thermal conductivity arises from the complex phonon dispersion and reduced energy gap between phonon branches, which greatly enhances phase space for phonon–phonon Umklapp scattering. This work demonstrates a unique system combining 3d and 5d transition metals in isostructural materials to enrich the system with various types of interactions.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Electron Correlation and Significantly Suppressed Thermal Conductivity in Dirac Nodal‐Line Metal Nanowires by Chemical Doping

et al. 2022

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“…Both IrO 2 and Al 2 O 3 may be present, though the former is known to be electrically conductive and the latter is not. [32,54] X-ray photoelectron spectroscopy (XPS) with depth profiling was carried out to confirm and identify the oxidative species at the Al/Ir interface, seen in Figure 3c for the 65.8 nm Ir film. Approximate etch depths measured from the top surface of the Al film are provided, with the emergence of characteristic Ir peaks at ≈80 nm (the Al thickness).…”

Section: Dominant Energy Carrier Transitionsmentioning

confidence: 99%

“…[27,28] At present, similar coupling effects and their impact on thermal transport are of growing interest in materials such as doped/polar semiconductors, [29,30] bilayer graphene, [31] and transition metal oxides. [32] Understanding these effects in metals, however, can shed further light on material systems where a coexistence of thermal energy carriers can be identified and tuned.…”

Section: Introductionmentioning

confidence: 99%

Dominant Energy Carrier Transitions and Thermal Anisotropy in Epitaxial Iridium Thin Films

Perez

Jog

Kwon

et al. 2022

Adv Funct Materials

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High aspect ratio metal nanostructures are commonly found in a broad range of applications such as electronic compute structures and sensing. The self-heating and elevated temperatures in these structures, however, pose a significant bottleneck to both the reliability and clock frequencies of modern electronic devices. Any notable progress in energy efficiency and speed requires fundamental and tunable thermal transport mechanisms in nanostructured metals. In this work, time-domain thermoreflectance is used to expose cross-plane quasi-ballistic transport in epitaxially grown metallic Ir(001) interposed between Al and MgO(001). Thermal conductivities ranges from roughly 65 (96 in-plane) to 119 (122 in-plane) W m −1 K −1 for 25.5-133.0 nm films, respectively. Further, low defects afforded by epitaxial growth are suspected to allow the observation of electron-phonon coupling effects in sub-20 nm metals with traditionally electron-mediated thermal transport. Via combined electro-thermal measurements and phenomenological modeling, the transition is revealed between three modes of cross-plane heat conduction across different thicknesses and an interplay among them: electron dominant, phonon dominant, and electron-phonon energy conversion dominant. The results substantiate unexplored modes of heat transport in nanostructured metals, the insights of which can be used to develop electro-thermal solutions for a host of modern microelectronic devices and sensing structures.

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Experimental observation of geometric effect on the electron diffraction of quasi-one-dimensional nanostructures

Zhang

Eaton

Mukherjee

et al. 2023

Materials Today Physics

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Remarkable suppression of lattice thermal conductivity by electron-phonon scattering in iridium dioxide nanowires

Cited by 6 publications

References 76 publications

Enhanced Electron Correlation and Significantly Suppressed Thermal Conductivity in Dirac Nodal‐Line Metal Nanowires by Chemical Doping

Enhanced Electron Correlation and Significantly Suppressed Thermal Conductivity in Dirac Nodal‐Line Metal Nanowires by Chemical Doping

Dominant Energy Carrier Transitions and Thermal Anisotropy in Epitaxial Iridium Thin Films

Experimental observation of geometric effect on the electron diffraction of quasi-one-dimensional nanostructures

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