Periodically-arrayed ferroelectric nanostructures induced by dislocation structures in strontium titanate

Masuda, Kairi; Lich, Le Van; Shimada, Takahiro; Kitamura, Takayuki

doi:10.1039/c9cp04147h

Cited by 11 publications

(8 citation statements)

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“…Recent piezo-force-microscopy and nonlinear optical investigations indeed show that individual dislocation structures have local polarization 8,24 , while the polar displacements are not significantly affected by electron doping 25 . Furthermore, modeling suggests that local electric polarization is enhanced in extended dislocation structures 9 .…”

Section: Structure Of Plastically Deformed Stomentioning

confidence: 99%

“…Since the local atomic arrangement is very different in dislocation cores than in the bulk, the electronic properties around individual dislocations have been found to be significantly modified in a diverse set of quantum materials [6][7][8] . Such effects are expected to be strongly amplified when dislocations assemble into larger structures 9 , yet this is experimentally virtually unexplored.…”

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Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

et al. 2021

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The properties of quantum materials are commonly tuned using experimental variables such as pressure, magnetic field and doping. Here we explore a different approach: irreversible, plastic deformation of single crystals. We show for the archetypal unconventional superconductor SrTiO3 that compressive plastic deformation induces lowdimensional superconductivity significantly above the superconducting transition temperature (Tc) of undeformed samples. We furthermore present evidence for unusual normal-state transport behaviour that suggests superconducting correlations at temperatures two orders of magnitude above the bulk Tc. The superconductivity enhancement is correlated with the appearance of structural features related to selforganized dislocation structures, as revealed by diffuse neutron and X-ray scattering.These results suggest that deformed SrTiO3 is a potential high-temperature superconductor, and push the limits of superconductivity in this low-density electronic system. More broadly, we demonstrate the promise of plastic deformation and dislocation engineering as tools to manipulate electronic properties of quantum materials.

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Section: Structure Of Plastically Deformed Stomentioning

confidence: 99%

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confidence: 99%

Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

et al. 2021

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“…As one direction of the developments, the application of phase-field simulation has gradually expanded to a smaller scale. For example, phase-field simulation of dislocation dynamics, coupling between ferroelectricity and dislocations, and thermal activated skyrmion motions has been conducted [4][5][6] . Such developments of phase-field simulations have undoubtedly clarified many material properties at the nanoscale but diffusive time scale where molecular dynamics (MD) and quantum mechanical simulations can not access.…”

Section: Introductionmentioning

confidence: 99%

Phase-field modelling for atoms

Masuda¹

2023

Preprint

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The application of phase-field modelling has been expanded into smaller and smaller-scale phenomena. However, phase-field modelling with a single atomic resolution has not been proposed so far. Here, we have developed atomic-scale phase-field modelling, that is, phase-field modelling for single atoms. We found that our modelling successfully reproduced the stabilization of Cu lattices under NVT and NPT conditions. Moreover, we found that our modelling allows us to use a longer time step than MD simulations to simulate atom dynamics. This research expands the application of phase-field simulation into the ultra-small scale, providing a powerful strategy to clarify atomic but longer time-scale phenomena.

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“…Here, we propose defect engineering to achieve atomic-scale polar topological order, including skyrmion and merons, even below the critical size. Defect engineering provides various features in materials; − furthermore, recent theoretical and experimental studies reported that manipulating oxygen vacancies in perovskite materials induces multiferroicity. − Notably, ferroelectricity was observed in paraelectric ceramics SrTiO 3 . , The emergence of multiferroicity around atomic vacancies originates from significant local lattice distortions, which introduce local symmetry breaking in their vicinity. Thus, the observation of local ferroelectricity in SrTiO 3 induced by atomic vacancies holds potential for realizing polar topological order below the critical size.…”

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Spontaneous Atomic-Scale Polar Skyrmions and Merons on a SrTiO₃ (001) Surface: Defect Engineering for Emerging Topological Orders

Minami,

Ikeda,

Shimada

2024

Nano Lett.

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The emergence of nontrivial topological order in condensed matter has been attracting a great deal of attention owing to its promising technological applications in novel functional nanodevices. In ferroelectrics, the realization of polar topological order at an ultimately small scale is extremely challenging due to the lack of chiral interaction and the critical size of the ferroelectricity. Here, we break through these limitations and demonstrate that the ultimate atomic-scale polar skyrmion and meron (∼2 nm) can be induced by engineering oxygen vacancies on the SrTiO 3 (001) surface based on first-principles calculations. The paraelectric-to-antiferrodistortive phase transition leads to a novel topological transition from skyrmion to meron, indicating phase−topology correlations. We also discuss accumulating and driving polar skyrmions based on the oxygen divacancy model; these results and the recent discovery of defect engineering techniques suggest the possibility of arithmetic operations on topological numbers through the natural self-organization and diffusion features of oxygen vacancies.

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Periodically-arrayed ferroelectric nanostructures induced by dislocation structures in strontium titanate

Abstract: A new engineering method of ferroelectric nanostructures: ferroelectric nanostructures induced and controlled by dislocation arrangements in SrTiO3.

Cited by 11 publications

References 52 publications

Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Phase-field modelling for atoms

Spontaneous Atomic-Scale Polar Skyrmions and Merons on a SrTiO₃ (001) Surface: Defect Engineering for Emerging Topological Orders

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Periodically-arrayed ferroelectric nanostructures induced by dislocation structures in strontium titanate

Abstract: A new engineering method of ferroelectric nanostructures: ferroelectric nanostructures induced and controlled by dislocation arrangements in SrTiO3.

Cited by 11 publications

References 52 publications

Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate

Phase-field modelling for atoms

Spontaneous Atomic-Scale Polar Skyrmions and Merons on a SrTiO3 (001) Surface: Defect Engineering for Emerging Topological Orders

Contact Info

Product

Resources

About

Spontaneous Atomic-Scale Polar Skyrmions and Merons on a SrTiO₃ (001) Surface: Defect Engineering for Emerging Topological Orders