Non-stoichiometry-induced metal-to-insulator transition in nickelate thin films grown by pulsed laser deposition
- Authors
- Lee, Jongmin; Choi, Kyoung Soon; Lee, Tae Kwon; Jeong, Il-Seok; Kim, Sangmo; Song, Jaesun; Bark, Chung Wung; Lee, Joo-Hyoung; Jung, Jong Hoon; Lee, Jouhahn; Kim, Tae Heon; Lee, Sanghan
- Issue Date
- Dec-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Metal-to-insulator transition; Thin film; Nickelate; Pulsed laser deposition
- Citation
- CURRENT APPLIED PHYSICS, v.18, no.12, pp.1577 - 1582
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 18
- Number
- 12
- Start Page
- 1577
- End Page
- 1582
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3012
- DOI
- 10.1016/j.cap.2018.10.006
- ISSN
- 1567-1739
- Abstract
- While controlling the cation contents in perovskite rare-earth nickelate thin films, a metal-to-insulator phase transition is reported. Systematic control of cation stoichiometry has been achieved by manipulating the irradiation of excimer laser in pulsed laser deposition. Two rare-earth nickelate bilayer thin-film heterostructures with the controlled cation stoichiometry (i.e. stoichiometric and Ni-excessive) have been fabricated. It is found that the Ni-excessive nickelate film is structurally less dense than the stoichiometric film, albeit both of them are epitaxial and coherent with respect to the underlying substrate. More interestingly, as a temperature decreases, a metal-to-insulator transition is only observed in the Ni-excessive nickelate films, which can be associated with the enhanced disproportionation of the Ni charge valence. Based on our theoretical results, possible origins (e.g. anti-site defects) of the low-temperature insulating state are discussed with the need of future work for deeper understanding. Our work can be utilized to realize unusual physical phenomena (e.g. metal-to-insulator phase transitions) in complex oxide films by manipulating the chemical stoichiometry in pulsed laser deposition.
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