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Sohn, Chang Hee
Laboratory for Unobtainable Functional Oxides
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Spectroscopic Studies on the Metal-Insulator Transition Mechanism in Correlated Materials

Author(s)
Kim, So YeunLee, Min-CheolHan, GaramKratochvilova, MarieYun, SeokhwanMoon, Soon JaeSohn, ChangheePark, Je-GeunKim, ChangyoungNoh, Tae Won
Issued Date
2018-10
DOI
10.1002/adma.201704777
URI
https://scholarworks.unist.ac.kr/handle/201301/26281
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201704777
Citation
ADVANCED MATERIALS, v.30, no.42, pp.1704777
Abstract
The metal-insulator transition (MIT) in correlated materials is a novel phenomenon that accompanies a large change in resistivity, often many orders of magnitude. It is important in its own right but its switching behavior in resistivity can be useful for device applications. From the material physics point of view, the starting point of the research on the MIT should be to understand the microscopic mechanism. Here, an overview of recent efforts to unravel the microscopic mechanisms for various types of MITs in correlated materials is provided. Research has focused on transition metal oxides (TMOs), but transition metal chalcogenides have also been studied. Along the way, a new class of MIT materials is discovered, the so-called relativistic Mott insulators in 5d TMOs. Distortions in the MO6 (M = transition metal) octahedron are found to have a large and peculiar effect on the band structure in an orbital dependent way, possibly paving a way to the orbital selective Mott transition. In the final section, the character of the materials suitable for applications is summarized, followed by a brief discussion of some of the efforts to control MITs in correlated materials, including a dynamical approach using light.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
0935-9648
Keyword (Author)
electron-electron correlationmetal-insulator transitionspectroscopytransition-metal oxides
Keyword
ELECTRONIC-STRUCTUREVANADIUM DIOXIDEMOTT INSULATORSFIELD-THEORYPHASESTATEPHOTOEMISSIONNIS2-XSEXCA2RUO4ANTIFERROMAGNETISM

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