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원자제어 저차원 전자계 연구단
원자제어 저차원 전자계 연구단
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Direct observation of the M2 phase with its Mott transition in a VO2 film

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Title
Direct observation of the M2 phase with its Mott transition in a VO2 film
Author(s)
Hoon Kim; Slusar T.V.; Dirk Wulferding; Ilkyu Yang; Cho J.-C.; Minkyung Lee; Hee Cheul Choi; Jeong Y.H.; Kim H.-T.; Jeehoon Kim
Publication Date
2016-12
Journal
APPLIED PHYSICS LETTERS, v.109, no.23, pp.233104 -
Publisher
AMER INST PHYSICS
Abstract
In VO2, the explicit origin of the insulator-to-metal transition is still disputable between Peierls and Mott insulators. Along with the controversy, its second monoclinic (M2) phase has received considerable attention due to the presence of electron correlation in undimerized vanadium ions. However, the origin of the M2 phase is still obscure. Here, we study a granular VO2 film using conductive atomic force microscopy and Raman scattering. Upon the structural transition from monoclinic to rutile, we observe directly an intermediate state showing the coexistence of monoclinic M1 and M2 phases. The conductivity near the grain boundary in this regime is six times larger than that of the grain core, producing a donut-like landscape. Our results reveal an intra-grain percolation process, indicating that VO2 with the M2 phase is a Mott insulator. © 2016 Author(s
URI
https://pr.ibs.re.kr/handle/8788114/3330
ISSN
0003-6951
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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