Direct observation of the lattice precursor of the metal-to-insulator transition in V2O3 thin films by surface acoustic waves

Kündel, J.; Pontiller, P.; Müller, Claus; Obermeier, G.; Liu, Z.; Nateprov, A. A.; Hörner, A.; Wixforth, Achim; Horn, S.; Tidecks, R.

doi:10.1063/1.4794948

Cited by 14 publications

(11 citation statements)

References 28 publications

(39 reference statements)

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“…We applied these methods to strained films exhibiting large variations in transition temperatures. Contrary to previous work, [33][34][35] we find no signature of decoupling between the structural and electronic transitions, to our measurement resolution. Our findings provide a significant constraint for any theory aiming to explain the MIT in V2O3 and put forward important experimental considerations regarding the interpretation of similar measurements in V2O3, VO2, and other Mott materials.…”

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confidence: 99%

“…[32] Rather, it was suggested that it starts smoothly before the full-fledged monoclinic distortion. More evidence for a structural precursor to the MIT was suggested from surface acoustic waves measurements [33] and Raman spectroscopy. [34] However, in the three latter studies the measured precursors were compared to the resistance, which is a poor indicator for the state of the sample, as we elucidate in the present work (see SI).…”

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confidence: 99%

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Robust Coupling between Structural and Electronic Transitions in a Mott Material

et al. 2019

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The interdependences of different phase transitions in Mott materials are fundamental to the understanding of the mechanisms behind them. One of the most important relations is between the ubiquitous structural and electronic transitions. Using IR spectroscopy, optical reflectivity and x-ray diffraction we show that the metal-insulator transition (MIT) is coupled to the structural phase transition in V2O3 films. This coupling persists even in films with widely varying transition temperatures and strains. Our findings are in contrast to recent experimental findings and theoretical predictions. Using V2O3 as a model system, we discuss the pitfalls in measurements of the electronic and structural states of Mott materials in general, calling for a critical examination of previous work in this field. Our findings also have important implications for the performance of Mott materials in next-generation neuromorphic computing technology.

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Robust Coupling between Structural and Electronic Transitions in a Mott Material

et al. 2019

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“…In addition, its resistivity at room temperature (10 Ωm) is lower than that of many transition metal oxides (manganese dioxide, ferric oxide, cobalt trioxide, etc) . These characteristics make V 2 O 3 as a promising material in the fields of temperature sensors, electromagnetic components, catalysts, supercapacitors, and lithium‐ion batteries …”

Section: Introductionmentioning

confidence: 99%

“…1,2 These characteristics make V 2 O 3 as a promising material in the fields of temperature sensors, electromagnetic components, catalysts, supercapacitors, and lithium-ion batteries. [3][4][5][6] As there are many phases in the oxygen-vanadium binary phase diagram, V 2 O 3 can only be prepared in a narrow stoichiometric range. Recently, some researches have reported several methods to prepare V 2 O 3 nanopowders, such as direct reduction, 7 pyrolysis, 8 nonaqueous solvent path, 9 sol-gel, 10 and hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis of crystalline V₂O₃ and amorphous V₂O₃/C as anode for lithium‐ion battery

Zhang

Qin

et al. 2019

J Am Ceram Soc

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In this paper, crystalline V 2 O 3 and amorphous V 2 O 3 /C products are synthesized via one-pot solution combustion synthesis (SCS) method (completed within 2 minutes).The characteristics of combustion products could be tuned by changing the amounts of glucose. The as-synthesized crystalline V 2 O 3 nanopowder consists of nanoparticles with average size of ~100 nm. Amorphous V 2 O 3 /C composite exhibits large porous microsheet structure in which oxygen vacancy-enabled amorphous V 2 O 3 particles are embedded into N-doped carbon microsheets. The existence of oxygen vacancies can promote energetics for the transport of electrons and ions and maintain the integrity of sample surface morphology. Moreover, N-doping can enhance electrical conductivity and promote the diffusion of electrons and lithium ions. Amorphous V 2 O 3 /C composite possesses high reversible capacity and superior cycling stability (833 mAh g −1 at 1 A g −1 after 250 cycles, 867 mAh g −1 at 0.1 A g −1 after 100 cycles), indicating its potential as excellent anode material for lithium-ion battery. The proposed one-step, time-and energy-efficient SCS method has the potential to prepare other oxygen vacancy-enabled transition metal oxides for energy storage. K E Y W O R D Slithium-ion battery, nitrogen-doping, oxygen vacancy, solution combustion synthesis, vanadium trioxide 2644 | WU et al. SUPPORTING INFORMATIONAdditional supporting information may be found online in the Supporting Information section. How to cite this article: Wu H, Zhang Z, Qin M, et al. Solution combustion synthesis of crystalline V 2 O 3 and amorphous V 2 O 3 /C as anode for lithium-ion battery. J Am Ceram Soc. 2020;103:2643-2652. https ://doi.

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“…This also provides a test bed for exploring the robustness of the coupling between phase transitions against large stress, a subject of intense debate. [9,[31][32][33][34][35][36][37][38][39][40][41]…”

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Structural Manipulation of Phase Transitions by Self‐Induced Strain in Geometrically Confined Thin Films

Kalcheim

Adda

Salev

et al. 2020

Adv Funct Materials

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Strain engineering is a well-known method often used to tune material properties in thin films. The most studied sources of strain are lattice mismatch and differential thermal contraction between the substrate and film. However, in materials which undergo a structural phase transition (SPT), a third and often overlooked source of strain may play a very significant role. If the substrate confines the area of the film, the SPT may induce stress which changes the evolution of the transition. This is a 2D analog of the isochoric phase transition between water and ice, where the freezing point drops below 0 °C. To illustrate this, the prototypical Mott insulator V 2 O 3 which has an SPT coupled to a metal-insulator transition is used to show how self-induced strain can drastically alter structural and electronic properties. This effect provides an elegant approach for mapping the phase diagram of the SPT and the transitions coupled to it. Moreover, the magnitude of self-straining is tunable by modifying the substrate morphology. This effect may be important for numerous materials which exhibit an SPT and are subjected to geometrical constraints.

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Direct observation of the lattice precursor of the metal-to-insulator transition in V2O3 thin films by surface acoustic waves

Cited by 14 publications

References 28 publications

Robust Coupling between Structural and Electronic Transitions in a Mott Material

Robust Coupling between Structural and Electronic Transitions in a Mott Material

Solution combustion synthesis of crystalline V₂O₃ and amorphous V₂O₃/C as anode for lithium‐ion battery

Structural Manipulation of Phase Transitions by Self‐Induced Strain in Geometrically Confined Thin Films

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Direct observation of the lattice precursor of the metal-to-insulator transition in V2O3 thin films by surface acoustic waves

Cited by 14 publications

References 28 publications

Robust Coupling between Structural and Electronic Transitions in a Mott Material

Robust Coupling between Structural and Electronic Transitions in a Mott Material

Solution combustion synthesis of crystalline V2O3 and amorphous V2O3/C as anode for lithium‐ion battery

Structural Manipulation of Phase Transitions by Self‐Induced Strain in Geometrically Confined Thin Films

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Solution combustion synthesis of crystalline V₂O₃ and amorphous V₂O₃/C as anode for lithium‐ion battery