Topological ferroelectric nanostructures induced by mechanical strain in strontium titanate

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

doi:10.1039/c9cp03802g

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…Based on these data, we consider that these dislocations influence the irregular changes in birefringence and optical indicatrix presented in Figures 2-4. It was proved in articles [23][24][25][26][27][28] that the main role among the defects in STO is dislocations, which are created during crystal growth. Another factor introducing high-density dislocations in STO is crystal polishing.…”

Section: Discussionmentioning

confidence: 99%

“…This points to the huge influence of local elastic stresses on crystal properties. The rich literature, to mention a few [23][24][25][26][27][28], on the defects in STO crystal, indicates the main role of dislocations created during crystal growth and/or their polishing. This becomes clearly apparent in a thin crystal with a thickness of 30 µm.…”

Section: Birefringence and Optical Indicatrix Orientations In Srtio3 ...mentioning

confidence: 99%

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Influence of Defects-Induced Stresses on Birefringence in SrTiO3 Single Crystals

2023

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Significant applications of SrTiO3 single crystals in electronics require knowledge about the influence of structural imperfections on their optical properties. Birefringence temperature changes were investigated in a few SrTiO3 single crystals in a broad temperature range, from 85 K to 250 K. The birefringence was found to be a non-linear function below the transition Ts at 105 K, and non-linear changes in the optical indicatrix orientation accompanied it. A weak residual birefringence was permanently present a dozen degrees above the phase transition temperature Ts. This is mainly connected with dislocations, which induce local stresses and shift transition points even up to about 200 K. The essential role of imperfections on optical properties was studied in a SrTiO3 24° bi-crystal reduced at 1000 K and under low oxygen pressure. In such an intentionally defected crystal, an increase of non-linearities in Δn(T) dependence was observed below and above the transition point Ts.

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Section: Discussionmentioning

confidence: 99%

Section: Birefringence and Optical Indicatrix Orientations In Srtio3 ...mentioning

confidence: 99%

Influence of Defects-Induced Stresses on Birefringence in SrTiO3 Single Crystals

2023

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“…One of the first theoretical predictions of the topological polar phase was made in the 2000s, where the polar vortex phase was predicted in the low dimensional ferroelectric system (i.e., PZT nanodisks, nanorods, and thin films) via ab initio calculations (Figure 3a). [ 101,102 ] Consequently, other theoretical studies have been reported on the vortex structure, [ 103–125 ] switching dynamics, [ 126–141 ] and properties [ 142–146 ] in various low‐dimensional ferroelectric systems. In particular, in 2006, using phase‐field simulations, J. Wang et al predicted the formation of polar vortex‐like structure in a ferroelectric nanodot (Figure 3b).…”

Section: Topological Polar Structuresmentioning

confidence: 99%

Theoretical Understanding of Polar Topological Phase Transitions in Functional Oxide Heterostructures: A Review

et al. 2022

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The exotic topological phase is attracting considerable attention in condensed matter physics and materials science over the past few decades due to intriguing physical insights. As a combination of “topology” and “ferroelectricity,” the ferroelectric (polar) topological structures are a fertile playground for emergent phenomena and functionalities with various potential applications. Herein, the review starts with the universal concept of the polar topological phase and goes on to briefly discuss the important role of computational tools such as phase‐field simulations in designing polar topological phases in oxide heterostructures. In particular, the history of the development of phase‐field simulations for ferroelectric oxide heterostructures is highlighted. Then, the current research progress of polar topological phases and their emergent phenomena in ferroelectric functional oxide heterostructures is reviewed from a theoretical perspective, including the topological polar structures, the establishment of phase diagrams, their switching kinetics and interconnections, phonon dynamics, and various macroscopic properties. Finally, this review offers a perspective on the future directions for the discovery of novel topological phases in other ferroelectric systems and device design for next‐generation electronic device applications.

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Entangled polarizations in ferroelectrics: A focused review of polar topologies

et al. 2023

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Topological ferroelectric nanostructures induced by mechanical strain in strontium titanate

Abstract: A new synthesis method of ferroelectric nanostructures: mechanical strain induces topological polarization in nanoporous SrTiO3.

Cited by 5 publications

References 45 publications

Influence of Defects-Induced Stresses on Birefringence in SrTiO3 Single Crystals

Influence of Defects-Induced Stresses on Birefringence in SrTiO3 Single Crystals

Theoretical Understanding of Polar Topological Phase Transitions in Functional Oxide Heterostructures: A Review

Entangled polarizations in ferroelectrics: A focused review of polar topologies

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