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나노 구조 물리 연구단
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Flexoelectric healing of intrinsically more conductive nanochannels in NdNiO3 thin films

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Title
Flexoelectric healing of intrinsically more conductive nanochannels in NdNiO3 thin films
Author(s)
Daehee Seol; Sungho Kim; Chadol Oh; Seung-Yang Heo; Woo-Sung Jang; Hu Young Jeong; Young-Min Kim; Junwoo Son; Yunseok Kim
Publication Date
2019-12
Journal
APPLIED SURFACE SCIENCE, v.497, no., pp.143727 -
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2019 Elsevier B.V.Rare-earth nickelates have received great attention owing to the extreme sensitivity of their metal-insulator transition (MIT) and particularly the local defect state under external perturbation. Accordingly, it is critical to effectively control their local defect state to tailor the MIT. However, although macroscopic MIT behavior has been extensively studied, the relationship between the local defect state related to polar discontinuity and MIT has been rarely investigated. Herein, we demonstrate the presence of intrinsic conductive nanochannels due to the Ni deficiency induced by the polar discontinuity and the flexoelectric healing of such nanochannels in NdNiO3 thin films using atomic force microscopy (AFM). The results indicate that the intrinsic conductive nanochannels are likely related to the Ni vacancy. Intriguingly, these conductive nanochannels are effectively removed by the application of mechanical force with the AFM tip, i.e., flexoelectric healing. Our findings suggest that mechanical stimuli can be one of the effective ways for modulating the intrinsic defect state and the corresponding properties at the nanoscale
URI
https://pr.ibs.re.kr/handle/8788114/6402
ISSN
0169-4332
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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