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Nanoscale Enhancement of the Local Optical Conductivity near Cracks in Metallic SrRuO3 Film

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Title
Nanoscale Enhancement of the Local Optical Conductivity near Cracks in Metallic SrRuO3 Film
Author(s)
Chang Jae Roh; Eun Kyo Ko; Chang, Yunyeong; Park, Soon Hee; Mun, Junsik; Kim, Miyoung; Tae Won Noh
Publication Date
2023-05
Journal
ACS Nano, v.17, no.9, pp.8233 - 8241
Publisher
American Chemical Society
Abstract
Cracking has been recognized as a major obstacle degrading material properties, including structural stability, electrical conductivity, and thermal conductivity. Recently, there have been several reports on the nanosized cracks (nanocracks), particularly in the insulating oxides. In this work, we comprehensively investigate how nanocracks affect the physical properties of metallic SrRuO3 (SRO) thin films. We grow SRO/SrTiO3 (STO) bilayers on KTaO3 (KTO) (001) substrates, which provide +1.7% tensile strain if the SRO layer is grown epitaxially. However, the SRO/STO bilayers suffer from the generation and propagation of nanocracks, and then, the strain becomes inhomogeneously relaxed. As the thickness increases, the nanocracks in the SRO layer become percolated, and its dc conductivity approaches zero. Notably, we observe an enhancement of the local optical conductivity near the nanocrack region using scanning-type near-field optical microscopy. This enhancement is attributed to the strain relaxation near the nanocracks. Our work indicates that nanocracks can be utilized as promising platforms for investigating local emergent phenomena related to strain effects.
URI
https://pr.ibs.re.kr/handle/8788114/13379
DOI
10.1021/acsnano.2c12333
ISSN
1936-0851
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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