Influence of tensile-strain-induced oxygen deficiency on metal-insulator transitions in NdNiO3−δ epitaxial thin films

Heo, Seungyang; Oh, Chadol; Son, Junwoo; Jang, Hyun M.

doi:10.1038/s41598-017-04884-2

Cited by 40 publications

(26 citation statements)

References 34 publications

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“…The in‐plane lattice parameters of LSMO thin films (

a_{LSMO}^{film}

) can be estimated by

c_{LSMO}^{film} = \frac{false(1 + ν false) a_{LSMO}^{bulk} - 2 ν a_{LSMO}^{film}}{1 - ν}

, where

c_{LSMO}^{film}

is the out‐of‐plane lattice parameter extracted from the X‐ray diffraction (XRD) patterns and ν (≈0.3) is the Poisson's ratio of LSMO. [ 33,34 ] The

a_{LSMO}^{film}

is 3.955, 3.896, 3.873, and 3.867 Å on the DSO, STO, LSAT, and LSAO substrates, respectively, indicating that LSMO is partially relaxed.…”

Section: Figurementioning

confidence: 99%

Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors

et al. 2021

Physica Rapid Research Ltrs

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Recently, doped HfO2 thin films have attracted considerable attention because of promising applications in complementary metal–oxide–semiconductor (CMOS)‐compatible ferroelectric memories. Herein, the ferroelectric properties and polarization fatigue of La:HfO2 thin‐film capacitors are reported. By varying the substrate lattice constant and film thickness, a robust remanent polarization of ≈16 μC cm−2 is achieved in a 12 nm‐thick Pt/La:HfO2/La0.67Sr0.33MnO3 capacitor. Fatigue measurements are conducted using designed pulse sequences, in which the voltage, pulse width, and interval time are changed to observe the evolution of switchable polarization with increasing cycles. Severe fatigue is observed when the La:HfO2 capacitors are partially switched and the interval between the bipolar switching is elongated. These behaviors may be ascribed to the domain wall pinning scenario, in which domain switching is blocked by the migration and aggregation of charges on non‐electroneutral walls. Further analysis of the fatigue behaviors with a nucleation‐limited‐switching model shows that the mean time and activation field for polarization switching are increased in fatigued La:HfO2 capacitors because electrical stimuli are required to disperse the aggregated charges before the domains are set free. These results facilitate the design and fabrication of HfO2‐based ferroelectric memories with improved device reliability.

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“…The in‐plane lattice parameters of LSMO thin films (

a_{LSMO}^{film}

) can be estimated by

c_{LSMO}^{film} = \frac{false(1 + ν false) a_{LSMO}^{bulk} - 2 ν a_{LSMO}^{film}}{1 - ν}

, where

c_{LSMO}^{film}

is the out‐of‐plane lattice parameter extracted from the X‐ray diffraction (XRD) patterns and ν (≈0.3) is the Poisson's ratio of LSMO. [ 33,34 ] The

a_{LSMO}^{film}

is 3.955, 3.896, 3.873, and 3.867 Å on the DSO, STO, LSAT, and LSAO substrates, respectively, indicating that LSMO is partially relaxed.…”

Section: Figurementioning

confidence: 99%

Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors

et al. 2021

Physica Rapid Research Ltrs

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“…As shown in FIGURE 1B, the c-lattice constants as a function of stoichiometry can be nicely fitted with the Gaussian function shown below: No.4 sample was also grown to further prove the validity of this method and the result was consistent. It should be noted that other factors such as anion concentration also affects the lattice [44], which could explains the slight changes of exact OOP lattice constants of our films. Then, a series of NdNiO3 films were grown using the calibration process mentioned above.…”

Section: Resultsmentioning

confidence: 88%

“…4 sample was also grown to further prove the validity of this method and the result was consistent. It should be noted that other factors such as anion concentration also affects the lattice [42], which could explain the slight changes in exact OOP lattice constants of our films.…”

Section: Effect Of Cation Stoichiometry On Ndnio 3 Filmsmentioning

confidence: 88%

Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates

Sun

Yang

et al. 2021

Front. Phys.

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The recent discovery of superconductivity in infinite-layer nickelate films has aroused great interest since it provides a new platform to explore the mechanism of high-temperature superconductivity. However, superconductivity only appears in the thin film form and synthesizing superconducting nickelate films is extremely challenging, limiting the in-depth studies on this compound. Here, we explore the critical parameters in the growth of high-quality nickelate films using molecular beam epitaxy. We found that stoichiometry is crucial in optimizing the crystalline structure and realizing superconductivity in nickelate films. In precursor NdNiO3 films, optimal stoichiometry of cations yields the most compact lattice while off-stoichiometry of cations causes obvious lattice expansion, influencing the subsequent topotactic reduction and the emergence of superconductivity in infinite-layer nickelates. Surprisingly, in-situ reflection high energy electron diffraction indicates that some impurity phases always appear once Sr ions are doped into NdNiO3 although the X-ray diffraction data are of high quality. While these impurity phases do not seem to suppress the superconductivity, their impacts on the electronic and magnetic structure deserve further studies. Our work demonstrates and highlights the significance of cation stoichiometry in the superconducting nickelate family.

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“…[63] The formation of O-vacancy defects will cause an increase in lattice-strain. [64,65] Apart from these types of surface defects, other lattice defects, for example, lattice dislocations, expansion, and distortion, may also change their physicochemical properties. [66] Therefore, the lattice strain, the oxygen defect, lattice deformation are strongly coupled with each other.…”

Section: Defect Chemistry Of Bifunctional Electrocatalystmentioning

confidence: 99%

Defect Electrocatalysts and Alkaline Electrolyte Membranes in Solid‐State Zinc–Air Batteries: Recent Advances, Challenges, and Future Perspectives

Zhang

et al. 2020

Small Methods

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Rechargeable zinc–air batteries (ZABs) have attracted much attention due to their promising capability for offering high energy density while maintaining a long operational lifetime. One of the biggest challenges in developing all‐solid‐state ZABs is to design suitable bifunctional air‐electrodes, which can efficiently catalyze the key oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) electrochemical processes. The other one is to develop robust electrolyte membranes with high ionic conductivity and superb water retention capability. In this review, an in‐depth discussion of the challenges, mechanisms, and design strategies for the defect electrocatalyst and the electrolyte membrane in all‐solid‐state ZABs will be offered. In particular, the crucial defect engineering strategies to tune the ORR/OER catalysts are summarized, including direct controllable strategies: 1) atomically dispersed metal sites control, 2) vacancy defects control, and 3) lattice‐strain control, and the indirect strategies: 4) crystallographic structure control and 5) metal–carbon support interaction control. Moreover, the most recent progress in designing electrolyte membranes, including polyvinyl alcohol‐based membranes and gel polymer electrolyte membranes, is presented. Finally, the perspectives are proposed for rational design and fabrication of the desired air electrode and electrolyte membrane to improve the performance and prolong the lifetime of all‐solid‐state ZABs.

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Influence of tensile-strain-induced oxygen deficiency on metal-insulator transitions in NdNiO3−δ epitaxial thin films

Cited by 40 publications

References 34 publications

Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors

Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors

Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates

Defect Electrocatalysts and Alkaline Electrolyte Membranes in Solid‐State Zinc–Air Batteries: Recent Advances, Challenges, and Future Perspectives

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Influence of tensile-strain-induced oxygen deficiency on metal-insulator transitions in NdNiO3−δ epitaxial thin films

Cited by 40 publications

References 34 publications

Ferroelectric Properties and Polarization Fatigue of La:HfO2 Thin‐Film Capacitors

Ferroelectric Properties and Polarization Fatigue of La:HfO2 Thin‐Film Capacitors

Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates

Defect Electrocatalysts and Alkaline Electrolyte Membranes in Solid‐State Zinc–Air Batteries: Recent Advances, Challenges, and Future Perspectives

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Product

Resources

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Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors

Ferroelectric Properties and Polarization Fatigue of La:HfO₂ Thin‐Film Capacitors