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Polar Metal Phase Induced by Oxygen Octahedral Network Relaxation in Oxide Thin Films

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Title
Polar Metal Phase Induced by Oxygen Octahedral Network Relaxation in Oxide Thin Films
Author(s)
Chang Jae Roh; Myung-Chul Jung; Jeong Rae Kim; Kyoung-June Go; Jinkwon Kim; Ho Jun Oh; Yong-Ryun Jo; Yeong Jae Shin; Jeong Gi Choi; Bong-Joong Kim; Do Young Noh; Si-Young Choi; Tae Won Noh; Myung Joon Han; Jong Seok Lee
Subject
oxygen octahedral network relaxation, ; polar ferromagnetic metal, ; SrRuO3, ; structural relaxation, ; symmetry breaking
Publication Date
2020-10
Journal
SMALL, v.16, no.40, pp.2003055
Publisher
WILEY-V C H VERLAG GMBH
Abstract
ABO(3)perovskite materials and their derivatives have inherent structural flexibility due to the corner sharing network of the BO(6)octahedron, and the large variety of possible structural distortions and strong coupling between lattice and charge/spin degrees of freedom have led to the emergence of intriguing properties, such as high-temperature superconductivity, colossal magnetoresistance, and improper ferroelectricity. Here, an unprecedented polar ferromagnetic metal phase in SrRuO3(SRO) thin films is presented, arising from the strain-controlled oxygen octahedral rotation (OOR) pattern. For compressively strained SRO films grown on SrTiO(3)substrate, oxygen octahedral network relaxation is accompanied by structural phase separation into strained tetragonal and bulk-like orthorhombic phases, and the asymmetric OOR evolution across the phase boundary allows formation of the polar phase, while bulk metallic and ferromagnetic properties are maintained. From the results, it is expected that other oxide perovskite thin films will also yield similar structural environments with variation of OOR patterns, and thereby provide promising opportunities for atomic scale control of material properties through strain engineering
URI
https://pr.ibs.re.kr/handle/8788114/7606
DOI
10.1002/smll.202003055
ISSN
1613-6810
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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