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

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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.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2020-09
Language
English
Article Type
Article
Citation

SMALL, v.16, pp.2003055

ISSN
1613-6810
DOI
10.1002/smll.202003055
URI
http://hdl.handle.net/10203/279353
Appears in Collection
PH-Journal Papers(저널논문)
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